{"product_id":"apr-catback-exhaust-system-rs4-rs5-b9-cbk0037","title":"APR Catback Exhaust System - RS4 \/ RS5 (B9)","description":"\u003cp\u003e\u003cstrong\u003eAPR Part Number: CBK0037\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFits Audi RS4 18-25, RS5 18-25\u003c\/p\u003e\u003ch2\u003eOverview\u003c\/h2\u003e\u003cdiv\u003ePLEASE NOTE: Some B9.5 vehicles may be equipped with an updated valve motor. Vehicles with valve actuator P\/N 8S0-133-246-D require adapter P\/N EXH0712, the required adapter is available at no charge with proof of purchase.\n\nIntroducing the APR Catback Exhaust System for the Audi B9 RS4 and RS5\n\nThe APR Catback Exhaust System for the Audi B9 RS4 and RS5 is a complete, high-performance exhaust solution that runs the entire length of the vehicle from the catalyst back. This system is engineered to boost performance, elevate sound, and enhance aesthetics with RS-style diamond black oval exhaust tips that are sure to make a statement. Crafted from premium materials and built with advanced manufacturing techniques, this system is designed to withstand harsh conditions and deliver lasting performance. Expect a bold, aggressive growl at wide-open throttle, along with an impressive gain of 9 horsepower and 15 FT-LBS of torque to all four wheels!\n\nUnmatched Design and Precision Engineering\n\nUnlike anything currently available, the APR system includes downpipes extending to the factory catalyst in the upper engine bay, making this a true full-system upgrade. We’ve minimized restrictions with smooth transitions, oversized piping, and straight-through mufflers and resonators. Constructed from mandrel-bent T304 stainless steel with a brushed finish and TIG welding throughout, this exhaust system is as durable as it is striking. Installation is hassle-free, thanks to precision-fit brackets, OEM-style slip clamps, and an included upgraded tunnel brace to accommodate the oversized piping.\n\nInspired by RS Performance\n\nLike the RS4 and RS5, this system stays with the unique single oversized midpipe design. It utilizes dual 2.75” (70mm) downpipes and midpipes that merge through a cast Y-junction into a massive 3.5” (91mm) midpipe. The integrated Helmholtz resonator minimizes drone through a straight-through design with a sound-canceling port, ensuring no compromise in exhaust flow.\n\nThe system splits again via another cast Y into two rear, valve-controlled mufflers with sound absorption technology. These valves are fully integrated with the OEM control system, adjusting automatically to enhance sound during aggressive driving while maintaining a quieter profile during cruising. Finally, exhaust gases exit through dual cast Y-junctions into a quad 2.5” (63.5mm) system, terminating via oversized 7.25”x5” RS-style exhaust tips. The tips feature a diamond black finish and a subtle APR logo for a refined touch.\n\nExperience the APR Difference\n\nDesigned for enthusiasts seeking the perfect balance of power, sound, style, and quality, the APR Catback Exhaust System for the Audi B9 RS4 and RS5 is a testament to engineering excellence. With its performance-driven design and durable construction, this system not only transforms your driving experience but also ensures years of reliable performance.\u003c\/div\u003e\u003ch3\u003eFeatures:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eComplete catalyst-back system including downpipes, extending from the factory catalyst back.\u003c\/li\u003e\n\u003cli\u003ePerformance gains of 9 HP and 15 FT-LBS of torque delivered to all four wheels.\u003c\/li\u003e\n\u003cli\u003ePremium T304 stainless steel construction with TIG welding for strength and durability.\u003c\/li\u003e\n\u003cli\u003eOptimized flow through dual 2.75” downpipes, 3.5” midpipe, and quad 2.5” exits.\u003c\/li\u003e\n\u003cli\u003eMandrel-bent brushed piping paired with electropolished cast splitters for a refined finish.\u003c\/li\u003e\n\u003cli\u003ePrecision brackets and slip clamps ensure accurate alignment and hassle-free installation.\u003c\/li\u003e\n\u003cli\u003eIncludes an upgraded tunnel brace to accommodate the larger piping.\u003c\/li\u003e\n\u003cli\u003eIntegrated Helmholtz resonator minimizes drone and enhances sound quality.\u003c\/li\u003e\n\u003cli\u003eValve-controlled rear mufflers dynamically adjust sound based on driving style.\u003c\/li\u003e\n\u003cli\u003eDual 7.25”x5” RS-style diamond black oval tips with APR logo.\u003c\/li\u003e\n\u003cli\u003eSmooth transitions and straight-through components maximize performance by reducing restrictions.\u003c\/li\u003e\n\u003cli\u003eStrikes the perfect balance of power, sound, style, and quality for enthusiasts.\u003c\/li\u003e\n\u003cli\u003eFully emissions compliant for worry-free operation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrackets\u003c\/th\u003e\n\u003ctd\u003ePrecise\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\t\u003ctd\u003e\n\t\tAPR\n\t\t\n\t\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCategory\u003c\/th\u003e\n\u003ctd\u003eExhaust\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClamping Type\u003c\/th\u003e\n\u003ctd\u003eSlip Clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClamps Included\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEmission Code\u003c\/th\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust Tip Color\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust Tip Diameter\u003c\/th\u003e\n\u003ctd\u003e7.25x5 IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust Tip Quantity\u003c\/th\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBrushed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade Type\u003c\/th\u003e\n\u003ctd\u003ePerformance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHangers Included\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMain Piping Diameter\u003c\/th\u003e\n\u003ctd\u003e2.75 IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003ctd\u003e3.00 IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003ctd\u003e3.50 IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eT304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMuffler Finish\u003c\/th\u003e\n\u003ctd\u003eBrushed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMuffler Quantity\u003c\/th\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMuffler Type\u003c\/th\u003e\n\u003ctd\u003eHelmholtz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003ctd\u003eSound Absorption\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePipe Bend Type\u003c\/th\u003e\n\u003ctd\u003eMandrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePipe Material\u003c\/th\u003e\n\u003ctd\u003eT304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eExhausts (Catback Systems)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSub Category\u003c\/th\u003e\n\u003ctd\u003eExhaust and Tail Pipes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSystem Type\u003c\/th\u003e\n\u003ctd\u003eCatback\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTail Pipe Outlet Outside Diameter\u003c\/th\u003e\n\u003ctd\u003e2.5 IN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTip Style\u003c\/th\u003e\n\u003ctd\u003eRS-Style Oval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTube Connection\u003c\/th\u003e\n\u003ctd\u003eButt Joint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eValve Included\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eValve Type\u003c\/th\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWelding\u003c\/th\u003e\n\u003ctd\u003eTIG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e810009932840\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003eCBK0037\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eEmissions\u003c\/h2\u003e\u003cdiv\u003e\u003cspan\u003e5\u003c\/span\u003e\u003c\/div\u003e\u003cbr\u003eThis part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.\u003ch2\u003eTech Resources\u003c\/h2\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003c\/div\u003e\t\u003ca href=\"https:\/\/documents.goapr.com\/98ca03301ac031ccfc7980cf043b644f02a7a30e.pdf\" title=\"Instructions - tl100202_b9rs5_catback_web.pdf\"\u003e\n\t\t\u003cdiv\u003eInstructions - tl100202_b9rs5_catback_web.pdf\u003c\/div\u003e\n\t\u003c\/a\u003e\n\u003c\/div\u003e\t\u003cdiv\u003e\n\t\t\u003cdiv\u003e\u003c\/div\u003e\n\t\t\u003cdiv\u003ePLEASE NOTE: Some B9.5 vehicles may be equipped with an updated valve motor. Vehicles with valve actuator P\/N 8S0-133-246-D require adapter P\/N EXH0712. The required adapter is available at no charge with proof of purchase.\nPlease call us at 1 (800) 680-7921 and request adapter EXH0712. We will expedite an adapter at no charge with proof of purchase.\u003c\/div\u003e\n\t\u003c\/div\u003e\u003ch2\u003eVehicle Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e2018–2019 Audi RS 5 (B9, F5) — 2.9L; United States\u003c\/li\u003e\n\u003cli\u003e2021–2024 Audi RS 5 (B9.5, F5) — 2.9L; United States\u003c\/li\u003e\n\u003cli\u003e2019–2019 Audi RS 5 Sportback — 2.9L; United States\u003c\/li\u003e\n\u003cli\u003e2021–2025 Audi RS 5 Sportback — 2.9L; United States\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment Requirements\u003c\/h3\u003e\u003cp\u003ePLEASE NOTE: Some B9.5 vehicles may be equipped with an updated valve motor. Vehicles with valve actuator P\/N 8S0-133-246-D require adapter P\/N EXH0712. The required adapter is available at no charge with proof of purchase.\u003c\/p\u003e\u003cp\u003ePlease call us at 1 (800) 680-7921 and request adapter EXH0712. We will expedite an adapter at no charge with proof of purchase.\u003c\/p\u003e\u003cp\u003eInstructions - tl100202_b9rs5_catback_web.pdf PLEASE NOTE: Some B9.5 vehicles may be equipped with an updated valve motor. Vehicles with valve actuator P\/N 8S0-133-246-D require adapter P\/N EXH0712. The required adapter is available at no charge with proof of purchase. Please call us at 1 (800) 680-7921 and request adapter EXH0712. We will expedite an adapter at no charge with proof of purchase.\u003c\/p\u003e","brand":"APR","offers":[{"title":"Default Title","offer_id":46302026170453,"sku":"CBK0037","price":2599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0074\/3702\/5395\/files\/38aaa64437564c24a98e1d4ea325b749ab06dea5.jpg?v=1791484794","url":"https:\/\/www.kiesmotorsports.com\/products\/apr-catback-exhaust-system-rs4-rs5-b9-cbk0037","provider":"Kies Motorsports","version":"1.0","type":"link"}