$595.00 USD
$595.00 USD












Transform the exhaust system of your BMW, Supra, or MINI with the MAD Plug & Play Exhaust Valve Controller. Designed to override factory settings, this controller empowers you with full customization of your exhaust flap, allowing you to tailor the sound and performance to perfectly match your driving style.
Unlike factory systems, which prioritize noise regulation and default settings, the MAD Valve Controller offers complete control, letting you seamlessly switch between factory modes, custom settings, or fully open exhaust.
With the new V2 controller software, G Body M Cars now support user-selectable valve positions for unparalleled flexibility:
Save your preferred settings with a simple button press, creating a bespoke exhaust sound and performance.
For Non-M G Body Vehicles: The middle button offers a fixed 50% mode.
For F Body Vehicles (pre-2019): Only the 100% and stock functions are available due to BMW programming.
Installing the MAD Valve Controller is quick and hassle-free:
Engineered for durability and convenience, the MAD Valve Controller is IP68 waterproof and equipped with a military-grade wire harness featuring a fireproof sheath. It retains your custom settings even after the vehicle restarts, ensuring consistent performance.
Fine-tune your exhaust sound to reduce rasp or drone, achieving the perfect balance of tone and performance.
Upgrade your exhaust system today with the MAD Plug & Play Exhaust Valve Controller and experience the freedom of complete customization for your BMW, Supra, or MINI. Whether you’re cruising the streets or hitting the track, this controller ensures your vehicle sounds and performs the way you want.
Free express shipping to all 48 contiguous U.S. states.
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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.