$595.00 USD
$595.00 USD






























The Valvetronic Designs Valved Axle-Back for the BMW G2X platform brings the next evolution in sound customization. Inspired by our renowned F-Chassis systems, this setup offers the flexibility to run OEM valve integration, pair with additional exhaust modifications, or enjoy as a standalone upgrade—all without compromising on fit, finish, or tone.
TIG-welded from T304 stainless steel and designed to utilize factory mounting points and cut locations, the system delivers an OEM+ installation and appearance, with 3.5" tips perfectly filling the rear bumper.
Valves Closed: All exhaust gases route through our precision-engineered quad-chambered muffler, delivering stock-level volume for early morning starts, stealthy commuting, and drone-free cruising.
Valves Open: The muffler is bypassed entirely, freeing the exhaust flow for a deeper, more engaging tone without unwanted cabin drone.
Whether you keep your exhaust otherwise stock or pair it with free-flow components, the system adapts to deliver a driving soundtrack tailored to you.
True OEM+ Fitment: Factory mounting points and cut locations for seamless installation.
Customizable Sound: Works perfectly as a standalone upgrade or part of a full exhaust build.
OEM Valve Integration: Operates through your BMW’s drive modes for instant control
2019–2024 BMW 330i (G20)
2019–2024 BMW 430i (G22 / G23)
Compatible with 330e (with modifications)
Compatible with 2025 models (with modifications)
Fully mandrel-bent for maximum flow
Precision TIG-welded for strength and durability
Premium T304 stainless steel construction
Customizable 3.5" outlet tips for a refined OEM+ look
OEM electronic valves with rapid open/close function
Valve integration with factory drive modes
Extension harness included for plug-and-play operation
100% reversible—return to stock at any time
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$595.00 USD
$595.00 USD
This product can expose you to chemicals such as lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
For a complete list of chemicals known to cause harm, visit https://www.p65warnings.ca.gov/chemicals.
Under the federal Clean Air Act (42 U.S.C. §7522(a)(3)), it is illegal to manufacture, sell, install, or use any part that defeats or alters a motor vehicle’s emission control system for use on public roads. Unless a product has received an Executive Order (EO) from the California Air Resources Board (CARB), it is not legal for use or installation on any pollution-controlled vehicle driven on public highways.
Some states have CARB-equivalent or independent emissions laws. Customers are responsible for verifying local regulations before purchasing or installing emissions-related products.
All performance, racing, or competition parts sold by this company are intended solely for off-road, closed-course, or competition use on vehicles that are never registered or used on public highways.
Kies Motorsports, LLC sells and markets these products for lawful use only. We do not condone or authorize the use of emission-control defeat devices or any modification that violates the Clean Air Act or state regulations.