Product Description
Active Autowerke Catless Downpipe BMW B58 2019+ M240i M340i M440i (Gen 2)
Designed to be as unrestrictive as possible
Casted upper V-Band for precise fitment
4.50″ diameter piping allows for maximum power output
Quicker turbo spool
Easily bolts-on – no cutting or welding required
Durable construction from TIG welded 304 stainless steel
Precise fitment
Made in Miami, Florida
Does not fit Gen 3 B58 TU2 found in many 2025+ BMW. Inquire if you are not sure what engine you have
The speed of a turbo’s impeller wheel is limited by exhaust back pressure. A larger down pipe relieves some of this pressure, resulting in quicker and more efficient spool. With Active Autowerke’s Signature downpipe, your B58 can rev quicker, and deliver more horsepower and torque.
Minimizing back pressure while retaining daily drive-ability was the goal of our B58 downpipe. Owners can now upgrade to a product that is affordable, reliable, and easy to install. Note: Because this down pipe modifies the factory emissions system it is designed for off-road or racing use only.
After months of research and development, our engineers settled on a 4.5” diameter pipe which utilizes the least number of bends possible. The large volume helps the turbo spool as quickly as possible by eliminating back pressure during spool up.
Constructed entirely from 304 stainless steel with 1.5MM wall thickness, we are confident that you’ll be pleased with how robust and durable this down pipe is. Trouble-free installation and a long lifespan ensure that you’ll enjoy many miles of performance with your B58!
