Fitment Information BMW M340 (2019, 2020, 2021, 2022, 2023, 2024, 2025) BMW M440 (2020, 2021, 2022, 2023, 2024, 2025) Fits rear wheel drive and AWD Xdrive models Specs & Features Reuses stock tips or upgrades to quad tips for personalized styling. Enhances sound with a rich, aggressive tone while remaining refined. Improves performance with optimized flow and larger diameter piping. Offers a completely reversible, bolt-on solution with no permanent modifications. Maintains OEM valve control for an ideal balance of sound and comfort. Product Description The MAD BMW M340/M440 Catback Exhaust System redefines the driving experience with enhanced performance, striking acoustics, and refined design. Engineered with precision, this exhaust system transforms your BMW into a statement of power and sophistication. Key Features and Highlights Seamless Stock Tip Integration: The system is designed to reuse your stock square tips for a clean, factory-like appearance. Two pipes will discreetly point downward below the rear bumper for flawless integration (see photos). Optional 90mm Quad Tip Upgrade: Choose from three 90mm quad tip options for a sporty look. This upgrade requires removing the OEM tips. Full Catback Design: A complete system offering a richer, more aggressive sound profile to elevate your driving experience. Effortless Installation: This 100% plug-and-play system requires no cutting, ensuring a straightforward and completely reversible modification. Premium Materials: Constructed entirely from 304 stainless steel for unmatched durability and corrosion resistance. Optimized Flow and Sound: Featuring a larger 3.5'' single midpipe and 2.75'' diameter piping to enhance flow, improve throttle response, and deliver a sportier exhaust note. Advanced Valve System Dual Valve Setup: Converts the factory single-valve system into a dual-valve design, akin to M-series cars. This upgrade ensures even flow and better sound management regardless of valve position. Retains OEM Controls: The stock exhaust valve actuator is repurposed, and an additional valve/actuator is integrated on the opposing side. The system works seamlessly with your vehicle’s cabin controls, maintaining quiet operation in Comfort mode and unleashing full performance in Sport mode.