MAD BMW Toyota B58 Fat Boy 5" Catless Downpipe M240 340 440 Supra

The MAD 5 inch Catless B58 Downpipe is a high-performance aftermarket upgrade for BMW B58 engine vehicles, designed to increase power and torque while improving exhaust flow. This downpipe is made from premium quality stainless steel and is precision-engineered to fit perfectly with the stock exhaust system, ensuring a seamless installation process.

With a 5 inch diameter, this downpipe provides unrestricted exhaust flow, which reduces backpressure and increases horsepower and torque output. It also features a catless design, which eliminates the factory catalytic converter for even more performance gains. This makes it an ideal choice for car enthusiasts who are looking to improve the performance and sound of their BMW B58 engine vehicles.

The MAD 5 inch Catless B58 Downpipe is designed to withstand the high temperatures and pressures of high-performance driving, ensuring reliable performance for years to come. 

Installation of the MAD 5 inch Catless B58 Downpipe is straightforward and can be completed with basic hand tools.

Overall, if you're looking to improve the performance and sound of your BMW B58 engine vehicle, the MAD 5 inch Catless B58 Downpipe is a must-have upgrade. It delivers significant performance gains while also adding a much needed sound improvment.

Expect up to a 30HP increase on a tuned BMW / Toyota Supra B58 with stock turbo, even more on cars with upgraded turbo.

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

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.

Free shipping in the U.S