{"product_id":"fi-exhaust-mercedes-amg-g63-w465-ultra-edition-valvetronic-exhaust-system-made-to-order-kies-motorsports","title":"Fi Exhaust Mercedes-AMG G63 W465 Ultra Edition Valvetronic Exhaust System - Made to Order","description":"\u003cstyle\u003e\n*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n:root {\n  --kies-red: #C8102E;\n  --kies-red-dark: #9E0C23;\n  --kies-red-light: #F7E8EA;\n  --kies-black: #111111;\n  --kies-ink: #1C1C1C;\n  --kies-mid: #E0DEDA;\n  --kies-steel: #9A9590;\n  --kies-muted: #7A756F;\n  --kies-light: #F0EDE8;\n  --kies-surface: #F8F6F3;\n  --kies-white: #FFFFFF;\n  --kies-success: #1F7A3F;\n  --kies-success-light: #E7F4EC;\n  --font-display: 'Barlow Condensed', sans-serif;\n  --font-body: 'Barlow', sans-serif;\n}\n\nbody { background: var(--kies-white); color: var(--kies-ink); font-family: var(--font-body); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }\n.shopify-product { max-width: 1400px; margin: 0 auto; padding: 32px 24px 80px; }\n\n.breadcrumbs { font-family: var(--font-display); font-size: 12px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--kies-muted); margin-bottom: 32px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }\n.breadcrumbs a { color: var(--kies-muted); text-decoration: none; transition: color 0.2s; }\n.breadcrumbs a:hover { color: var(--kies-red); }\n.breadcrumbs .sep { color: var(--kies-mid); }\n.breadcrumbs .current { color: var(--kies-ink); }\n\n.product-top { max-width: 900px; margin: 0 auto 80px; }\n.product-brand { font-family: var(--font-display); font-size: 13px; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--kies-red); margin-bottom: 12px; }\n.made-to-order-tag { display: inline-block; font-family: var(--font-display); font-size: 11px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; background: var(--kies-ink); color: var(--kies-white); padding: 6px 12px; margin-bottom: 16px; }\n.product-title { font-family: var(--font-display); font-size: clamp(32px, 4vw, 52px); font-weight: 800; line-height: 1.05; letter-spacing: -0.01em; text-transform: uppercase; color: var(--kies-ink); margin-bottom: 8px; }\n.product-subtitle { font-family: var(--font-display); font-size: 20px; font-weight: 500; letter-spacing: 0.04em; color: var(--kies-muted); text-transform: uppercase; margin-bottom: 32px; }\n\n.spec-strip { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--kies-mid); border-bottom: 1px solid var(--kies-mid); margin-bottom: 32px; }\n.spec-strip-item { padding: 18px 4px; border-right: 1px solid var(--kies-mid); }\n.spec-strip-item:last-child { border-right: none; }\n.spec-strip-item:nth-child(n+2) { padding-left: 20px; }\n.spec-label { font-family: var(--font-display); font-size: 11px; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--kies-muted); margin-bottom: 4px; }\n.spec-value { font-family: var(--font-display); font-size: 20px; font-weight: 700; color: var(--kies-ink); }\n\n.product-lede { font-size: 17px; line-height: 1.65; color: var(--kies-ink); margin-bottom: 28px; }\n.product-lede strong { font-weight: 700; }\n\n.feature-pills { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px; align-items: center; }\n.feature-pill { font-family: var(--font-display); font-size: 12px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--kies-ink); padding: 4px 0 4px 14px; border-left: 2px solid var(--kies-mid); background: transparent; cursor: default; }\n.feature-pill.accent { color: var(--kies-red); border-left-color: var(--kies-red); font-weight: 700; }\n\n.section { margin-bottom: 72px; }\n.section-eyebrow { font-family: var(--font-display); font-size: 12px; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--kies-red); margin-bottom: 12px; display: flex; align-items: center; gap: 12px; }\n.section-eyebrow::before { content: ''; display: inline-block; width: 36px; height: 2px; background: var(--kies-red); }\n.section-title { font-family: var(--font-display); font-size: clamp(28px, 3.5vw, 40px); font-weight: 800; line-height: 1.1; letter-spacing: -0.01em; text-transform: uppercase; color: var(--kies-ink); margin-bottom: 24px; max-width: 800px; }\n.section-body { font-size: 16px; line-height: 1.7; color: var(--kies-ink); max-width: 820px; }\n.section-body p { margin-bottom: 16px; }\n.section-body strong { font-weight: 700; }\n\n.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1px; background: var(--kies-mid); border: 1px solid var(--kies-mid); margin-top: 32px; }\n.feature-card { background: var(--kies-white); padding: 28px 24px; transition: background 0.2s; }\n.feature-card:hover { background: var(--kies-surface); }\n.feature-card-num { font-family: var(--font-display); font-size: 11px; font-weight: 700; letter-spacing: 0.14em; color: var(--kies-red); margin-bottom: 12px; }\n.feature-card-title { font-family: var(--font-display); font-size: 20px; font-weight: 700; text-transform: uppercase; color: var(--kies-ink); margin-bottom: 8px; line-height: 1.15; }\n.feature-card-desc { font-size: 14px; line-height: 1.55; color: var(--kies-muted); }\n\n.tech-tabs { display: flex; flex-wrap: wrap; border-bottom: 1px solid var(--kies-mid); margin-bottom: 32px; }\n.tech-tab { font-family: var(--font-display); font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; background: transparent; color: var(--kies-muted); border: none; border-bottom: 2px solid transparent; padding: 14px 20px; cursor: pointer; transition: all 0.15s; margin-bottom: -1px; }\n.tech-tab:hover { color: var(--kies-ink); }\n.tech-tab.active { color: var(--kies-ink); border-bottom-color: var(--kies-red); }\n.tech-panel { display: none; }\n.tech-panel.active { display: block; max-width: 820px; }\n.tech-panel h3 { font-family: var(--font-display); font-size: 26px; font-weight: 700; text-transform: uppercase; color: var(--kies-ink); margin-bottom: 14px; }\n.tech-panel p { font-size: 15px; line-height: 1.65; color: var(--kies-ink); margin-bottom: 12px; }\n\n.spec-table { width: 100%; border-collapse: collapse; margin-top: 24px; }\n.spec-table tr { border-bottom: 1px solid var(--kies-mid); }\n.spec-table tr:first-child { border-top: 1px solid var(--kies-mid); }\n.spec-table td { padding: 16px 0; font-size: 15px; vertical-align: top; }\n.spec-table td:first-child { font-family: var(--font-display); font-size: 13px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--kies-muted); width: 240px; padding-right: 24px; }\n.spec-table td:last-child { color: var(--kies-ink); }\n\n.faq-list { margin-top: 24px; max-width: 900px; }\n.faq-item { border-bottom: 1px solid var(--kies-mid); }\n.faq-item:first-child { border-top: 1px solid var(--kies-mid); }\n.faq-q { font-family: var(--font-display); font-size: 19px; font-weight: 700; text-transform: uppercase; color: var(--kies-ink); padding: 22px 48px 22px 0; cursor: pointer; position: relative; background: none; border: none; width: 100%; text-align: left; line-height: 1.25; }\n.faq-q::after { content: '+'; position: absolute; right: 0; top: 50%; transform: translateY(-50%); font-size: 28px; color: var(--kies-red); font-weight: 400; }\n.faq-item.open .faq-q::after { content: '−'; }\n.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; font-size: 15px; line-height: 1.65; color: var(--kies-ink); }\n.faq-item.open .faq-a { max-height: 500px; padding: 0 0 24px; }\n\n\/* CONFIGURATOR *\/\n.configurator { background: var(--kies-surface); border: 1px solid var(--kies-mid); padding: 48px 40px; margin-bottom: 72px; }\n.configurator-header { border-bottom: 1px solid var(--kies-mid); padding-bottom: 20px; margin-bottom: 32px; }\n.configurator-header h2 { font-family: var(--font-display); font-size: 32px; font-weight: 800; text-transform: uppercase; margin-bottom: 6px; letter-spacing: -0.005em; }\n.configurator-header p { font-size: 15px; color: var(--kies-muted); }\n\n.config-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }\n@media (max-width: 900px) { .config-grid { grid-template-columns: 1fr; } }\n\n.config-section h3 { font-family: var(--font-display); font-size: 14px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--kies-red); margin-bottom: 18px; padding-bottom: 8px; border-bottom: 2px solid var(--kies-red); }\n\n.option-block { margin-bottom: 24px; }\n.option-label { font-family: var(--font-display); font-size: 13px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--kies-ink); margin-bottom: 10px; display: block; }\n.option-buttons { display: flex; flex-wrap: wrap; gap: 6px; }\n.option-btn { font-family: var(--font-display); font-size: 13px; font-weight: 600; letter-spacing: 0.05em; background: var(--kies-white); color: var(--kies-ink); border: 1px solid var(--kies-mid); padding: 10px 16px; cursor: pointer; transition: all 0.15s; }\n.option-btn:hover { border-color: var(--kies-ink); }\n.option-btn.active { background: var(--kies-ink); color: var(--kies-white); border-color: var(--kies-ink); }\n\n.build-summary { background: var(--kies-white); border: 1px solid var(--kies-mid); padding: 18px 22px; margin-bottom: 24px; }\n.build-summary-title { font-family: var(--font-display); font-size: 12px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--kies-muted); margin-bottom: 10px; }\n.build-summary ul { list-style: none; padding: 0; margin: 0; }\n.build-summary li { display: flex; justify-content: space-between; padding: 6px 0; font-size: 13px; border-bottom: 1px solid var(--kies-light); gap: 16px; }\n.build-summary li:last-child { border-bottom: none; }\n.build-summary li .label { font-family: var(--font-display); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--kies-muted); font-size: 11px; flex-shrink: 0; }\n.build-summary li .value { color: var(--kies-ink); font-weight: 600; text-align: right; font-size: 13px; }\n\n.form-row { margin-bottom: 14px; }\n.form-row.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }\n@media (max-width: 500px) { .form-row.two-col { grid-template-columns: 1fr; } }\n\n.form-label { font-family: var(--font-display); font-size: 12px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--kies-ink); display: block; margin-bottom: 5px; }\n.form-label .req { color: var(--kies-red); }\n.form-label .hint { color: var(--kies-muted); font-weight: 500; letter-spacing: 0; text-transform: none; font-size: 11px; }\n.form-input, .form-textarea { width: 100%; font-family: var(--font-body); font-size: 14px; color: var(--kies-ink); background: var(--kies-white); border: 1px solid var(--kies-mid); padding: 11px 13px; transition: border-color 0.15s; }\n.form-input:focus, .form-textarea:focus { outline: none; border-color: var(--kies-red); }\n.form-textarea { resize: vertical; min-height: 72px; }\n\n.submit-btn { display: block; width: 100%; background: var(--kies-red); color: var(--kies-white); font-family: var(--font-display); font-size: 16px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; padding: 18px; border: none; cursor: pointer; transition: background 0.15s; margin-top: 8px; }\n.submit-btn:hover { background: var(--kies-red-dark); }\n.submit-btn:disabled { background: var(--kies-steel); cursor: not-allowed; }\n.submit-note { font-size: 12px; color: var(--kies-muted); text-align: center; margin-top: 10px; line-height: 1.4; }\n\n.success-message { display: none; background: var(--kies-success-light); border: 1px solid var(--kies-success); padding: 28px 26px; margin-top: 20px; }\n.success-message.show { display: block; }\n.success-message h4 { font-family: var(--font-display); font-size: 22px; font-weight: 800; text-transform: uppercase; color: var(--kies-success); margin-bottom: 8px; }\n.success-message p { font-size: 14px; color: var(--kies-ink); }\n\n.error-message { display: none; background: var(--kies-red-light); border: 1px solid var(--kies-red); padding: 14px 18px; margin-top: 14px; font-size: 13px; color: var(--kies-red-dark); }\n.error-message.show { display: block; }\n\n.pricing-note { background: var(--kies-black); color: var(--kies-white); padding: 32px 36px; margin-bottom: 32px; border-left: 4px solid var(--kies-red); }\n.pricing-note .eyebrow { font-family: var(--font-display); font-size: 12px; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--kies-red); margin-bottom: 10px; }\n.pricing-note h2 { font-family: var(--font-display); font-size: 26px; font-weight: 800; text-transform: uppercase; margin-bottom: 10px; line-height: 1.1; }\n.pricing-note p { font-size: 15px; color: #D4D2CE; line-height: 1.6; }\n\n@media (max-width: 600px) {\n  .spec-strip { grid-template-columns: 1fr; }\n  .spec-strip-item { border-right: none; border-bottom: 1px solid var(--kies-mid); }\n  .spec-strip-item:last-child { border-bottom: none; }\n  .spec-strip-item:nth-child(n+2) { padding-left: 4px; }\n  .configurator { padding: 28px 20px; }\n  .pricing-note { padding: 24px 24px; }\n}\n\u003c\/style\u003e\n\u003cmain class=\"shopify-product\"\u003e\n\u003csection class=\"product-top\"\u003e\n\u003cdiv class=\"product-brand\"\u003eFi exhaust\u003c\/div\u003e\n\u003cspan class=\"made-to-order-tag\"\u003eMade to Order · Custom Built\u003c\/span\u003e\n\u003ch1 class=\"product-title\"\u003eMercedes-AMG W465 G63\u003cbr\u003eUltra Edition Exhaust\u003c\/h1\u003e\n\u003cdiv class=\"product-subtitle\"\u003eValvetronic Catback · Ultra-High-Flow Downpipes\u003c\/div\u003e\n\u003cdiv class=\"spec-strip\"\u003e\n\u003cdiv class=\"spec-strip-item\"\u003e\n\u003cdiv class=\"spec-label\"\u003eMaterial\u003c\/div\u003e\n\u003cdiv class=\"spec-value\"\u003eT304 SST\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-strip-item\"\u003e\n\u003cdiv class=\"spec-label\"\u003eYear\u003c\/div\u003e\n\u003cdiv class=\"spec-value\"\u003e2024+\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-strip-item\"\u003e\n\u003cdiv class=\"spec-label\"\u003eEngine\u003c\/div\u003e\n\u003cdiv class=\"spec-value\"\u003e4.0T M177\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"product-lede\"\u003eThe pinnacle valvetronic exhaust for the new \u003cstrong\u003eW465 Mercedes-AMG G63\u003c\/strong\u003e. The Fi Exhaust Ultra Edition unlocks the full character of the twin-turbo 4.0T M177 V8 — quiet enough for the daily, savage enough for the canyon, and engineered to deliver an estimated \u003cstrong\u003e5–10% horsepower gain\u003c\/strong\u003e when paired with full catless downpipes.\u003c\/p\u003e\n\u003cdiv class=\"feature-pills\"\u003e\n\u003cspan class=\"feature-pill accent\"\u003eValvetronic Technology\u003c\/span\u003e \u003cspan class=\"feature-pill\"\u003eT304 Stainless\u003c\/span\u003e \u003cspan class=\"feature-pill\"\u003eOPF \/ Non-OPF\u003c\/span\u003e \u003cspan class=\"feature-pill\"\u003eOEM Sport Button\u003c\/span\u003e \u003cspan class=\"feature-pill\"\u003e+5–10% HP\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv class=\"pricing-note\"\u003e\n\u003cdiv class=\"eyebrow\"\u003eMade to Order\u003c\/div\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(11, 186, 234);\"\u003eConfigured to your G63. Built when you order.\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eEvery Fi Exhaust Ultra Edition is custom-fabricated to the configuration you select below — downpipe type, tip style, finish, coating, and OPF\/Non-OPF fitment. Because each system is built to spec, pricing varies by configuration. Submit your build below and a Kies Motorsports specialist will respond with exact pricing, lead time, and confirmation of fitment within one business day.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- ============================================================\n       CONFIGURATOR + FORM\n       Submissions go to info@kiesmotorsports.com via Formspree.\n       Replace YOUR_FORMSPREE_ID in the form action with your real ID.\n       ============================================================ --\u003e\n\u003csection class=\"configurator\" id=\"configurator\"\u003e\n\u003cdiv class=\"configurator-header\"\u003e\n\u003ch2\u003eBuild Your Exhaust\u003c\/h2\u003e\n\u003cp\u003eConfigure your Ultra Edition, then send us your build. No payment due now.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cform id=\"quoteForm\" action=\"https:\/\/formspree.io\/f\/xqejebvp\" method=\"POST\"\u003e\n\u003cinput type=\"hidden\" name=\"_subject\" value=\"Quote Request — Fi Exhaust G63 Ultra Edition\"\u003e \u003cinput type=\"hidden\" name=\"_replyto\" id=\"replyto\" value=\"\"\u003e \u003cinput type=\"hidden\" name=\"Product\" value=\"Fi Exhaust Mercedes-AMG W465 G63 Ultra Edition\"\u003e \u003cinput type=\"hidden\" name=\"Build - Catback\" id=\"hidden-catback\" value=\"Valvetronic Catback\"\u003e \u003cinput type=\"hidden\" name=\"Build - Downpipe\" id=\"hidden-downpipe\" value=\"Catless Standard\"\u003e \u003cinput type=\"hidden\" name=\"Build - Tips\" id=\"hidden-tip\" value=\"Triple Square — Silver\"\u003e \u003cinput type=\"hidden\" name=\"Build - Coating\" id=\"hidden-coating\" value=\"None\"\u003e \u003cinput type=\"hidden\" name=\"Build - Control\" id=\"hidden-control\" value=\"OEM Sport Button\"\u003e \u003cinput type=\"hidden\" name=\"Build - OPF Config\" id=\"hidden-opf\" value=\"Not Sure — Help Me Confirm\"\u003e\n\u003cdiv class=\"config-grid\"\u003e\n\u003c!-- LEFT: BUILD OPTIONS --\u003e\n\u003cdiv class=\"config-section\"\u003e\n\u003ch3\u003eStep 1 · Configure Your Build\u003c\/h3\u003e\n\u003cdiv class=\"option-block\"\u003e\n\u003clabel class=\"option-label\"\u003eCatback System\u003c\/label\u003e\n\u003cdiv class=\"option-buttons\" data-group=\"catback\"\u003e\n\u003cbutton type=\"button\" class=\"option-btn active\" data-val=\"Valvetronic Catback\"\u003eValvetronic Catback\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Catback + Mid-Pipe\"\u003eCatback + Mid-Pipe\u003c\/button\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"option-block\"\u003e\n\u003clabel class=\"option-label\"\u003eDownpipe\u003c\/label\u003e\n\u003cdiv class=\"option-buttons\" data-group=\"downpipe\"\u003e\n\u003cbutton type=\"button\" class=\"option-btn active\" data-val=\"Catless Standard\"\u003eCatless Standard\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Catless Sensor\"\u003eCatless Sensor\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Sport 200-Cell\"\u003eSport 200-Cell\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"OEM (Skip)\"\u003eOEM (Skip)\u003c\/button\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"option-block\"\u003e\n\u003clabel class=\"option-label\"\u003eTip Style\u003c\/label\u003e\n\u003cdiv class=\"option-buttons\" data-group=\"tip\"\u003e\n\u003cbutton type=\"button\" class=\"option-btn active\" data-val=\"Triple Square — Silver\"\u003eTriple Square · Silver\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Triple Square — Matte Black\"\u003eTriple Square · Matte Black\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Quad Tip — Silver\"\u003eQuad · Silver\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Quad Tip — Matte Black\"\u003eQuad · Matte Black\u003c\/button\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"option-block\"\u003e\n\u003clabel class=\"option-label\"\u003eCoating\u003c\/label\u003e\n\u003cdiv class=\"option-buttons\" data-group=\"coating\"\u003e\n\u003cbutton type=\"button\" class=\"option-btn active\" data-val=\"None\"\u003eNone\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Ceramic\"\u003eCeramic\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Gold Ceramic\"\u003eGold Ceramic\u003c\/button\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"option-block\"\u003e\n\u003clabel class=\"option-label\"\u003eValve Control\u003c\/label\u003e\n\u003cdiv class=\"option-buttons\" data-group=\"control\"\u003e\n\u003cbutton type=\"button\" class=\"option-btn active\" data-val=\"OEM Sport Button\"\u003eOEM Sport Button\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"+ Fi Pro Remote\"\u003e+ Fi Pro Remote\u003c\/button\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"option-block\"\u003e\n\u003clabel class=\"option-label\"\u003eOPF Configuration\u003c\/label\u003e\n\u003cdiv class=\"option-buttons\" data-group=\"opf\"\u003e\n\u003cbutton type=\"button\" class=\"option-btn active\" data-val=\"Not Sure — Help Me Confirm\"\u003eNot Sure — Confirm For Me\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"OPF\"\u003eOPF\u003c\/button\u003e \u003cbutton type=\"button\" class=\"option-btn\" data-val=\"Non-OPF\"\u003eNon-OPF\u003c\/button\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- RIGHT: REVIEW + CONTACT INFO --\u003e\n\u003cdiv class=\"config-section\"\u003e\n\u003ch3\u003eStep 2 · Review \u0026amp; Send\u003c\/h3\u003e\n\u003cdiv class=\"build-summary\"\u003e\n\u003cdiv class=\"build-summary-title\"\u003eYour Build\u003c\/div\u003e\n\u003cul id=\"buildSummary\"\u003e\n\u003cli\u003e\n\u003cspan class=\"label\"\u003eCatback\u003c\/span\u003e\u003cspan class=\"value\" id=\"sum-catback\"\u003eValvetronic Catback\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"label\"\u003eDownpipe\u003c\/span\u003e\u003cspan class=\"value\" id=\"sum-downpipe\"\u003eCatless Standard\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"label\"\u003eTips\u003c\/span\u003e\u003cspan class=\"value\" id=\"sum-tip\"\u003eTriple Square — Silver\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"label\"\u003eCoating\u003c\/span\u003e\u003cspan class=\"value\" id=\"sum-coating\"\u003eNone\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"label\"\u003eControl\u003c\/span\u003e\u003cspan class=\"value\" id=\"sum-control\"\u003eOEM Sport Button\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"label\"\u003eOPF\u003c\/span\u003e\u003cspan class=\"value\" id=\"sum-opf\"\u003eNot Sure — Help Me Confirm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"form-row two-col\"\u003e\n\u003cdiv\u003e\n\u003clabel class=\"form-label\" for=\"firstName\"\u003eFirst Name \u003cspan class=\"req\"\u003e*\u003c\/span\u003e\u003c\/label\u003e \u003cinput type=\"text\" id=\"firstName\" name=\"First Name\" class=\"form-input\" required=\"\"\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003clabel class=\"form-label\" for=\"lastName\"\u003eLast Name \u003cspan class=\"req\"\u003e*\u003c\/span\u003e\u003c\/label\u003e \u003cinput type=\"text\" id=\"lastName\" name=\"Last Name\" class=\"form-input\" required=\"\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"form-row\"\u003e\n\u003clabel class=\"form-label\" for=\"email\"\u003eEmail \u003cspan class=\"req\"\u003e*\u003c\/span\u003e\u003c\/label\u003e \u003cinput type=\"email\" id=\"email\" name=\"Email\" class=\"form-input\" required=\"\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"form-row\"\u003e\n\u003clabel class=\"form-label\" for=\"phone\"\u003ePhone\u003c\/label\u003e \u003cinput type=\"tel\" id=\"phone\" name=\"Phone\" class=\"form-input\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"form-row two-col\"\u003e\n\u003cdiv\u003e\n\u003clabel class=\"form-label\" for=\"city\"\u003eCity\u003c\/label\u003e \u003cinput type=\"text\" id=\"city\" name=\"City\" class=\"form-input\"\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003clabel class=\"form-label\" for=\"country\"\u003eCountry \u003cspan class=\"req\"\u003e*\u003c\/span\u003e\u003c\/label\u003e \u003cinput type=\"text\" id=\"country\" name=\"Country\" class=\"form-input\" required=\"\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"form-row two-col\"\u003e\n\u003cdiv\u003e\n\u003clabel class=\"form-label\" for=\"vehicleYear\"\u003eVehicle Year \u003cspan class=\"req\"\u003e*\u003c\/span\u003e\u003c\/label\u003e \u003cinput type=\"text\" id=\"vehicleYear\" name=\"Vehicle Year\" class=\"form-input\" placeholder=\"e.g. 2025\" required=\"\"\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003clabel class=\"form-label\" for=\"vin\"\u003eVIN \u003cspan class=\"hint\"\u003e(optional)\u003c\/span\u003e\u003c\/label\u003e \u003cinput type=\"text\" id=\"vin\" name=\"VIN\" class=\"form-input\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"form-row\"\u003e\n\u003clabel class=\"form-label\" for=\"notes\"\u003eAdditional Notes\u003c\/label\u003e \u003ctextarea id=\"notes\" name=\"Additional Notes\" class=\"form-textarea\" placeholder=\"Plans for tuning, install location, timing, questions, etc.\"\u003e\u003c\/textarea\u003e\n\u003c\/div\u003e\n\u003c!-- Honeypot for spam protection (hidden from users) --\u003e \u003cinput type=\"text\" name=\"_gotcha\" style=\"display: none;\"\u003e \u003cbutton type=\"submit\" class=\"submit-btn\" id=\"submitBtn\"\u003eSend Quote Request\u003c\/button\u003e\n\u003cp class=\"submit-note\"\u003eSubmissions go directly to info@kiesmotorsports.com. A specialist will respond within one business day with exact pricing and lead time.\u003c\/p\u003e\n\u003cdiv class=\"error-message\" id=\"errorMessage\"\u003eSomething went wrong. Please try again or email us directly at info@kiesmotorsports.com.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/form\u003e\n\u003cdiv class=\"success-message\" id=\"successMessage\"\u003e\n\u003ch4\u003e✓ Quote Request Received\u003c\/h4\u003e\n\u003cp\u003eThanks for your interest in the Fi Exhaust G63 Ultra Edition. A Kies Motorsports specialist will review your build configuration and respond to your email within one business day with exact pricing, lead time, and any questions about fitment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"section-eyebrow\"\u003eOverview\u003c\/div\u003e\n\u003ch2 class=\"section-title\"\u003eA roaring masterpiece of engineering for the new G63.\u003c\/h2\u003e\n\u003cdiv class=\"section-body\"\u003e\n\u003cp\u003eIf you're behind the wheel of a \u003cstrong\u003eW465 Mercedes-AMG G63\u003c\/strong\u003e, you already know you've got a beast. The question is whether you're done leaving horsepower, voice, and presence on the table. The \u003cstrong\u003eFi Exhaust Ultra Edition\u003c\/strong\u003e is the answer — a complete valvetronic exhaust system engineered to amplify what AMG built, without compromising the daily-driver manners that make this truck so livable.\u003c\/p\u003e\n\u003cp\u003eBuilt around \u003cstrong\u003eT304 stainless steel\u003c\/strong\u003e and precision-fabricated muffler internals, every component is designed to flow harder, weigh less, and last longer than what came off the line. \u003cstrong\u003eValvetronic technology\u003c\/strong\u003e handles the rest — closed valves route gases through the muffler for a low-profile cruise, open valves unleash the full V8 baritone the M177 was always capable of.\u003c\/p\u003e\n\u003cp\u003eWhen paired with the \u003cstrong\u003eultra-high-flow catless downpipes\u003c\/strong\u003e, expect a \u003cstrong\u003e5–10% horsepower gain\u003c\/strong\u003e on the 4.0T twin-turbo — and an even bigger jump once you stack ECU tuning on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"section-eyebrow\"\u003eWhy It Wins\u003c\/div\u003e\n\u003ch2 class=\"section-title\"\u003eFive reasons the Ultra Edition is the benchmark.\u003c\/h2\u003e\n\u003cdiv class=\"feature-grid\"\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cdiv class=\"feature-card-num\"\u003e01\u003c\/div\u003e\n\u003cdiv class=\"feature-card-title\"\u003ePerformance Boost\u003c\/div\u003e\n\u003cdiv class=\"feature-card-desc\"\u003eSignificant horsepower and torque gains across the rev range from reduced back pressure and optimized flow.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cdiv class=\"feature-card-num\"\u003e02\u003c\/div\u003e\n\u003cdiv class=\"feature-card-title\"\u003eInnovative Design\u003c\/div\u003e\n\u003cdiv class=\"feature-card-desc\"\u003ePrecision-engineered piping geometry and chamber design maximize efficiency at every RPM.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cdiv class=\"feature-card-num\"\u003e03\u003c\/div\u003e\n\u003cdiv class=\"feature-card-title\"\u003eQuality Materials\u003c\/div\u003e\n\u003cdiv class=\"feature-card-desc\"\u003ePremium T304 stainless steel construction promises long-term durability and corrosion resistance.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cdiv class=\"feature-card-num\"\u003e04\u003c\/div\u003e\n\u003cdiv class=\"feature-card-title\"\u003eSound Excellence\u003c\/div\u003e\n\u003cdiv class=\"feature-card-desc\"\u003eCustom muffler internals blend aggressive race-mode bark with a refined street-mode cruise.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cdiv class=\"feature-card-num\"\u003e05\u003c\/div\u003e\n\u003cdiv class=\"feature-card-title\"\u003eVersatile Style\u003c\/div\u003e\n\u003cdiv class=\"feature-card-desc\"\u003eTriple-square or quad tips, silver or matte black — each etched with the Fi Exhaust logo.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"section-eyebrow\"\u003eTechnology\u003c\/div\u003e\n\u003ch2 class=\"section-title\"\u003eEvery component, configurable.\u003c\/h2\u003e\n\u003cdiv class=\"tech-tabs\"\u003e\n\u003cbutton class=\"tech-tab active\" data-tab=\"valve\"\u003eValvetronic\u003c\/button\u003e \u003cbutton class=\"tech-tab\" data-tab=\"dp-standard\"\u003eCatless Standard\u003c\/button\u003e \u003cbutton class=\"tech-tab\" data-tab=\"dp-sensor\"\u003eCatless Sensor\u003c\/button\u003e \u003cbutton class=\"tech-tab\" data-tab=\"dp-sport\"\u003eSport 200-Cell\u003c\/button\u003e \u003cbutton class=\"tech-tab\" data-tab=\"oem-button\"\u003eOEM Button\u003c\/button\u003e \u003cbutton class=\"tech-tab\" data-tab=\"tips\"\u003eTips\u003c\/button\u003e \u003cbutton class=\"tech-tab\" data-tab=\"coating\"\u003eCoatings\u003c\/button\u003e \u003cbutton class=\"tech-tab\" data-tab=\"opf\"\u003eOPF \/ Non-OPF\u003c\/button\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tech-panel active\" data-panel=\"valve\"\u003e\n\u003ch3\u003eValvetronic Technology\u003c\/h3\u003e\n\u003cp\u003eEvery Fi Exhaust system is built around valvetronic technology — not just for sound control, but to resolve the long-standing contradiction in exhaust design between high-RPM horsepower and low-RPM torque.\u003c\/p\u003e\n\u003cp\u003eClosed valves route gases through the muffler for back-pressure-friendly torque at low revs. Open valves give the M177 the high-flow, high-RPM breathing path it deserves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tech-panel\" data-panel=\"dp-standard\"\u003e\n\u003ch3\u003eCatless Standard Downpipes\u003c\/h3\u003e\n\u003cp\u003eUltra-high-flow catless downpipes remove the restrictive factory catalytic converters, opening up exhaust gas flow and delivering the largest performance gains and the highest sound volume of any downpipe option.\u003c\/p\u003e\n\u003cp\u003eThis is the recommended path if you plan to go further with ECU tuning — it removes the single biggest restriction in the factory exhaust system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tech-panel\" data-panel=\"dp-sensor\"\u003e\n\u003ch3\u003eCatless Sensor Version\u003c\/h3\u003e\n\u003cp\u003eSame ultra-high-flow catless design as the standard version, but with an integrated dummy oxygen sensor housing to reduce the likelihood of triggering a check engine light (CEL).\u003c\/p\u003e\n\u003cp\u003eThe right choice for owners who want the performance and sound of a true catless setup without dealing with codes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tech-panel\" data-panel=\"dp-sport\"\u003e\n\u003ch3\u003eSport 200-Cell Downpipes\u003c\/h3\u003e\n\u003cp\u003eFor owners who want the gains of an aftermarket downpipe with the emissions profile of a catalyzed system, the Sport 200-Cell uses larger cells and metallic substrates for a smooth, durable, burn-out-resistant build.\u003c\/p\u003e\n\u003cp\u003eConverting the factory 400–800 CPSI converter to a 200-cell metallic significantly increases airflow while preserving torque-friendly back pressure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tech-panel\" data-panel=\"oem-button\"\u003e\n\u003ch3\u003eOEM Sport Button Compatibility\u003c\/h3\u003e\n\u003cp\u003eFi Exhaust's intelligent valve module ties directly into the factory exhaust button and AMG drive modes — open and close the valves the way Mercedes intended, no extra controllers, no extra wiring in the cabin.\u003c\/p\u003e\n\u003cp\u003eFor owners who want more granular control, the Fi Pro remote is available as an optional upgrade.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tech-panel\" data-panel=\"tips\"\u003e\n\u003ch3\u003eTip Styles\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTriple Square (TIP-G63ue-S):\u003c\/strong\u003e The classic Ultra Edition signature — three square outlets per side, each etched with the Fi Exhaust logo. Available in standard silver or matte black.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuad Tip (TIP-G63Aue-CRMB):\u003c\/strong\u003e A more aggressive quad-outlet layout for owners who want a different aesthetic. Same engraving, same finish options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tech-panel\" data-panel=\"coating\"\u003e\n\u003ch3\u003eCeramic \u0026amp; Gold Ceramic Coating\u003c\/h3\u003e\n\u003cp\u003eFi Exhaust ditches traditional thermal insulation wraps and instead applies a nano-ceramic coating directly to the exhaust. The result is lower heat radiated into the engine bay, longer life for adjacent components like wiring, and a finish that resists discoloration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGold Ceramic\u003c\/strong\u003e adds a reflective metallic layer for even better thermal management on heat-sensitive setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tech-panel\" data-panel=\"opf\"\u003e\n\u003ch3\u003eOPF \/ Non-OPF Fitments\u003c\/h3\u003e\n\u003cp\u003eOPF (Otto Particulate Filter, also known as GPF) is the particulate filter Mercedes adds to G63 models destined for markets with stricter emissions standards. Non-OPF models flow freer out of the box.\u003c\/p\u003e\n\u003cp\u003eFi Exhaust develops separate fitments for both versions so the system bolts up precisely no matter where your G63 was originally delivered.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"section-eyebrow\"\u003eSpecifications\u003c\/div\u003e\n\u003ch2 class=\"section-title\"\u003eThe details that matter.\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eMercedes-AMG W465 G63 (2024+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine\u003c\/td\u003e\n\u003ctd\u003e4.0L Twin-Turbo V8 — M177\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eT304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Type\u003c\/td\u003e\n\u003ctd\u003eValvetronic Catback with optional downpipes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEstimated HP Gain\u003c\/td\u003e\n\u003ctd\u003e5–10% with full catless system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Control\u003c\/td\u003e\n\u003ctd\u003eOEM sport button \/ AMG drive modes; optional Fi Pro remote\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTip Options\u003c\/td\u003e\n\u003ctd\u003eTriple Square or Quad — Silver or Matte Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDownpipe Options\u003c\/td\u003e\n\u003ctd\u003eCatless Standard · Catless Sensor · Sport 200-Cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating Options\u003c\/td\u003e\n\u003ctd\u003eNone · Ceramic · Gold Ceramic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmissions Compatibility\u003c\/td\u003e\n\u003ctd\u003eOPF and Non-OPF fitments available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eWorks with both Fi Exhaust and factory\/aftermarket downpipes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBuild Type\u003c\/td\u003e\n\u003ctd\u003eMade to order — fabricated to spec after quote acceptance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU Reference\u003c\/td\u003e\n\u003ctd\u003eMB-G63Aue-CBOE + TIP-G63Aue-S + CAB-MTM × 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"section-eyebrow\"\u003eFAQ\u003c\/div\u003e\n\u003ch2 class=\"section-title\"\u003eQuestions, answered.\u003c\/h2\u003e\n\u003cdiv class=\"faq-list\"\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cbutton class=\"faq-q\"\u003eWhy is this product made to order?\u003c\/button\u003e\n\u003cdiv class=\"faq-a\"\u003e\n\u003cp\u003eEach Fi Exhaust Ultra Edition is fabricated to the specific configuration you select — downpipe type, tip style, finish, coating, and OPF\/Non-OPF fitment. Because no two builds are identical and components are built on demand, pricing and lead time depend on configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cbutton class=\"faq-q\"\u003eWhat is the typical lead time?\u003c\/button\u003e\n\u003cdiv class=\"faq-a\"\u003e\n\u003cp\u003eLead times generally run 4–8 weeks depending on configuration, coatings, and current production schedule. Your Kies Motorsports specialist will confirm exact timing with your quote.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cbutton class=\"faq-q\"\u003eWhat is Fi Valvetronic Exhaust Technology on the AMG G63?\u003c\/button\u003e\n\u003cdiv class=\"faq-a\"\u003e\n\u003cp\u003eFi's Valvetronic Technology lets you toggle between loud and quiet exhaust notes using electronically actuated valves that adjust exhaust flow. It enhances both performance and sound, delivering an aggressive race-mode tone and a refined street-mode cruise on demand.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cbutton class=\"faq-q\"\u003eWhat does the full Fi Exhaust setup for the W465 G63 include?\u003c\/button\u003e\n\u003cdiv class=\"faq-a\"\u003e\n\u003cp\u003eThe complete setup includes a valvetronic catback, your choice of ultra-high-flow catless downpipes (standard or sensor version) or Sport 200-cell downpipes, triple-square or quad tips in silver or matte black, the optional Fi Pro remote, and optional ceramic or gold ceramic coating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cbutton class=\"faq-q\"\u003eHow do I control the exhaust valves?\u003c\/button\u003e\n\u003cdiv class=\"faq-a\"\u003e\n\u003cp\u003eThree ways: the factory exhaust button or AMG drive modes, the optional Fi Pro remote control, or a mobile app.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cbutton class=\"faq-q\"\u003eWhat is the difference between OPF and Non-OPF models?\u003c\/button\u003e\n\u003cdiv class=\"faq-a\"\u003e\n\u003cp\u003eOPF (Otto Particulate Filter) is the particulate filter Mercedes equips on G63s destined for stricter emissions markets. Non-OPF models lack this filter, allowing freer exhaust flow, slightly higher gains, and a more aggressive sound signature.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cbutton class=\"faq-q\"\u003eIs the Ultra Edition compatible with aftermarket or factory downpipes?\u003c\/button\u003e\n\u003cdiv class=\"faq-a\"\u003e\n\u003cp\u003eYes. The Ultra Edition catback is designed to work with Fi Exhaust downpipes, factory downpipes, and most major third-party downpipes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cbutton class=\"faq-q\"\u003eWhat horsepower gain should I expect?\u003c\/button\u003e\n\u003cdiv class=\"faq-a\"\u003e\n\u003cp\u003eWhen paired with a full catless system (valvetronic catback plus ultra-high-flow downpipes), expect an estimated 5–10% horsepower gain on the 4.0T M177 V8. Gains scale further when combined with ECU tuning.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/main\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Fi Exhaust","offers":[{"title":"Default Title","offer_id":42557408870485,"sku":"FI-G63-Exhaust","price":20000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0074\/3702\/5395\/files\/kies-motorsports-fi-exhaust-fi-exhaust-mercedes-amg-g63-w465-ultra-edition-valvetronic-exhaust-system-made-to-order-kies-motorsports-1241099712.webp?v=1780340867","url":"https:\/\/www.kiesmotorsports.com\/products\/fi-exhaust-mercedes-amg-g63-w465-ultra-edition-valvetronic-exhaust-system-made-to-order-kies-motorsports","provider":"Kies Motorsports","version":"1.0","type":"link"}