$595.00 USD
$595.00 USD






Unleash the full potential of your BMW X3M or X4M with the MAD Resonated Single Midpipe, engineered to deliver an exceptional balance of performance, sound quality, and durability. Designed specifically for the 2019+ BMW F97 X3M and F98 X4M models equipped with the S58 engine, this premium midpipe provides a significant improvement over restrictive factory exhaust components.
Featuring a resonated design, this midpipe eliminates rasp and startup rattles while maintaining a deep, refined exhaust tone free of drone at cruising speeds. Whether paired with the stock exhaust, an axle-back system, or upgraded downpipes, the MAD Resonated Midpipe enhances your vehicle’s sound profile while optimizing exhaust flow for measurable performance gains.
Resonated Construction – Integrated resonator removes harsh rasp, ensures smooth acoustics, and prevents drone during highway cruising.
Performance Upgrade – Increases horsepower, torque, and throttle response by improving exhaust gas flow.
Aggressive Yet Refined Sound – Produces a deep, sporty exhaust tone that complements the S58 engine’s character.
Premium Build Quality – Precision-engineered from high-grade materials for strength, durability, and long-term reliability.
Perfect Fitment – Direct bolt-on installation designed for seamless integration with OEM and aftermarket exhaust systems.
2019–2023 BMW X3M (F97)
2019–2023 BMW X4M (F98)
Elevate your driving experience with the MAD Resonated Single Midpipe – the ultimate upgrade for BMW enthusiasts seeking performance gains and a refined, motorsport-inspired exhaust note.
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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.