Meet the MAD B58 Fat Boy 5'' catless downpipe.

The perfect addition to your upgraded turbo or high horsepower b58 motor!

Upgrade to the MAD BMW / Toyota Supra B58 downpipe to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our 5 inch downpipe, your turbo can now spool even 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 flex pipe Section will help reduce the stress and unwanted vibration caused by heat and engine Movement. 

Features:

• 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

Fitment:

• 2015+ BMW M240i & Xdrive
• 2016-2019 BMW 340i & 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