$595.00 USD
$595.00 USD
















Unleash the full potential of your BMW X3 M40i (G01) or X4 M40i (G02) with the MAD Catback Exhaust System. Designed for vehicles equipped with the B58 engine, this exhaust system delivers a remarkable balance of deep sound, performance improvements, and aesthetic appeal. Experience a dynamic exhaust note, free from drone or rattle, while boosting your vehicle's overall performance.
The MAD Catback Exhaust transforms your BMW’s exhaust note into a refined, deep midrange sound that enhances the sporty character of your car without being overly aggressive. This system is engineered for a crisp, rasp-free exhaust note throughout the RPM range, ensuring an exhilarating driving experience every time you hit the road.
Upgrade your BMW with the MAD X3/X4 M40 Catback Exhaust System and experience improved performance, a refined sound, and a sporty new look. It’s the ultimate exhaust solution for BMW enthusiasts seeking the perfect balance of sound, style, and performance.
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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.