Upgrade from the stock B58 downpipe to the MAD B58 catless downpipe for maximum airflow, power, and sound!
Upgrade to the MAD BMW / Toyota Supra B58 downpipe to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our downpipe, your turbo can now spool faster and achieve maximum power. As a bonus, your car will sound a lot nicer as well.
Expect up to a 30HP increase on a tuned BMW / Toyota Supra B58 with stock turbo, even more on cars with upgraded turbo.
The heat will expand/weaken the pipes, while with engine movement, the flex pipe will help reduce the stress on that red hot expanded/weakened pipes.
- Compatible with right-hand drive and left-hand drive vehicles
- Smooth bends for maximum airflow without any drone
- Up to 30HP increase on the stock turbos, even more on upgraded turbos
- Lifetime warranty on defects and fitment
- 90 day return period
- All orders ship in 1-2 business days
- Spot on fitment
- Flex section
- 2015+ BMW M240i & Xdrive
- 2016-2019 BMW 340i & Xdrive
- 2020+ BMW M340i & Xdrive
- 2016+ BMW 440i & Xdrive
- 2016+ BMW 540i & Xdrive
- 2016+ BMW 740i & Xdrive
- 2017-2020 X3 M40
- 2017-2020 X4 M40
- 2019+ Toyota Supra 3.0L