Description
Upgrade from the stock B58 downpipe to the MAD B58 catted downpipe for maximum airflow, power, and sound. Designed for BMW enthusiasts seeking a significant performance and exhaust upgrade, this system delivers improved horsepower, torque, and throttle response.
Crafted from premium quality 304 stainless steel, this downpipe is engineered to withstand extreme temperatures and harsh driving conditions. The optimized piping design ensures smooth exhaust flow for enhanced engine performance and driving experience.
This unit features high-flow catalytic converters designed to reduce harmful emissions while maintaining strong performance levels. The 200-cell catalyst design provides maximum flow with minimal back pressure, resulting in a more aggressive exhaust note and improved efficiency.
The downpipe is a direct bolt-on replacement for the stock exhaust system with no cutting or welding required. It is also compatible with aftermarket exhaust systems for additional customization options.
Race use only.
Features
- Compatible with right-hand drive and left-hand drive vehicles
- Smooth bends for maximum airflow without any drone
- Up to 30HP increase on stock turbos, with higher gains on upgraded turbo setups
- Lifetime warranty on defects and fitment
- All orders ship in 1-2 business days
- Spot on fitment
- Flex section included
- 200 CEL high flow catalytic converters
- Direct bolt-on installation
- Compatible with stock and aftermarket exhaust systems
- Constructed from premium 304 stainless steel
NOTE: Downpipe gasket is not included. Part #18328612538 is required for installation.
Fitment
2015+ BMW M240i & xDrive
2016-2019 BMW 340i & xDrive
2020+2024 BMW M340i & xDrive Does not fit 2025
2016+ BMW 440i & xDrive
2016+ BMW 540i & xDrive
2016+ BMW 740i & xDrive
2017-2024 X3 M40 G01/G02
2017-2024 X4 M40 G01/G02
2019+ G05 BMW X5 40i & xDrive
2019+ G07 BMW X7 40i & xDrive
2019+ G29 BMW Z4 M40i
2019+ Toyota Supra 3.0L
Emissions Disclaimer
This product is not legal for sale or use on pollution-controlled vehicles operated on public roads, highways, or streets. It is intended for off-road, race, or closed-course competition use only, where such modifications are permitted.
By purchasing this product, you acknowledge and agree that:
- You are responsible for compliance with all applicable emissions laws and regulations.
- MAD and its affiliates disclaim any liability for improper or unlawful use of this product.
- Use of this part on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws.
Please check your local laws before purchase and installation.
