$595.00 USD
$595.00 USD




























Enhance the performance, sound, and style of your BMW 540i with the MAD Axle-Back Exhaust System, engineered specifically for the G30 chassis equipped with the B58 engine (2017–2023). Designed for driving enthusiasts who value both form and function, this performance exhaust system is a significant upgrade from the restrictive stock system, delivering both increased power potential and an enhanced driving experience.
Constructed from premium-grade stainless steel, the MAD axle-back system ensures long-lasting durability and high resistance to corrosion under various driving conditions. The advanced exhaust flow design reduces backpressure, allowing your turbocharged B58 engine to breathe more freely, resulting in improved throttle response and overall performance.
In addition to performance gains, the MAD system delivers a deep, clean, and refined exhaust note that emphasizes the inline-six’s natural tone without excessive drone. Whether you’re on the street or spirited backroad drives, this system strikes the perfect balance between sporty presence and everyday livability.
Aesthetically, the large 90mm exhaust tips add an aggressive, motorsport-inspired look to the rear of the vehicle. The exhaust system is designed to be fully compatible with both M Sport and non-M Sport bumpers, making it a versatile upgrade for all G30 540i owners. Installation is simple and straightforward, featuring a direct bolt-on design that requires no major modifications.
Large 90mm dual exhaust tips for a bold, performance-oriented appearance
Precision-engineered for the B58-powered BMW 540i G30 (2017–2023)
Compatible with M Sport and non-M Sport rear bumpers
No diffuser required for non-M Sport bumper configurations
Constructed from high-quality stainless steel for maximum durability and corrosion resistance
Optimized exhaust flow for improved performance and throttle response
Deep, refined exhaust note with minimal drone
Direct bolt-on fitment – no cutting or welding required
BMW 540i G30 (2017–2023) with B58 engine
Fits both M Sport and non-M Sport rear bumper configurations
Upgrade your BMW 540i with the MAD Axle-Back Exhaust System and experience enhanced performance, refined sound, and aggressive styling in one precision-engineered package.
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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.