Upgrade from the stock B58 downpipe to the MAD B58 catless downpipe for maximum airflow, power, and sound! The Mad Catless B58 Downpipe is an essential upgrade for any BMW enthusiast looking to maximize the performance of their B58 engine. Made from high-quality materials, this downpipe is designed to provide maximum exhaust flow and improve turbo spool time, resulting in increased horsepower and torque. The Mad Catless B58 Downpipe is constructed from High quality 304 stainless steel, which provides excellent durability and resistance to corrosion. The catless design eliminates the restrictive catalytic converter, allowing for maximum exhaust flow and reducing backpressure. This results in a noticeable increase in power and throttle response, as well as a more aggressive exhaust note. The Mad Catless B58 Downpipe is designed to be a direct bolt-on replacement for the factory downpipe, making installation quick and easy. The downpipe is also designed to work seamlessly with the factory exhaust system, so there's no need to worry about compatibility issues. Overall, the Mad Catless B58 Downpipe is a must-have upgrade for any BMW B58 engine owner who wants to improve performance and unleash the full potential of their car. 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 2017-2020 X3 M40 2017-2020 X4 M40 2019+ G05 BMW X5 40i & xDrive 2019+ G07 BMW X7 40i & xDrive 2019+ G29 BMW Z4 M40i 2019+ Toyota Supra 3.0L