Upgrade from the stock N55 downpipe to the MAD N55 catless downpipe for maximum airflow, power, and sound!
Upgrade to the MAD BMW N55 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 N55 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.
- 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
- 2012-2013 M135 (Up tp 07/13 production)
- 2012-2013 335 Sedan (Up to 07/13 production)