Active Autowerke Catless Downpipe BMW B58 G2X M240i M340i M440i

Turbochargers are powered by spent exhaust gases created during the combustion process. The quicker these gases are evacuated, the better. Unfortunately, the factory down pipe in the B58 is quite restrictive, which results in slower exhaust gases and slower turbo spool.
The Active Autowerke G-Chassis B58 Signature down pipe utilizes 4.5 diameter stainless steel piping in order to provide more power, quicker spool, and extreme durability. It then tapers down to 3.5" where we've incorporated a stainless flex joint and then down to 80mm to meet the OEM exhaust system. We never drop the diameter to smaller than the stock diameter of 80mm.

Features:
-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

Active Autowerke B58 Signature Downpipe 

Benefits
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!

Fits RWD and AWD

Fits B58 and B58TU (Gen1 and Gen2)

• 2016–2021 BMW 240/M240 F22/F23
• 2022-2024 BMW M240i G42
• 2016-2019 BMW 340i F30/F31/F34
• 2016-2019 BMW 440i F32/F33/F36
• 2020-2024 BMW M340i G20/G21
• 2016-2024 BMW 440i G22/G23/G26
• 2016-2024 BMW 540i G30/G31
• 2017-2023 BMW 640i G32
• 2016-2024 BMW 740i G11/G12
• 2018-2024 BMW 840i G14/G15/G16
• 2017-2024 BMW X3 M40 G01
• 2017-2024 BMW X4 M40 G02
• 2017-2024 BMW X5 M40 G05
• 2017-2024 BMW X6 M40 G06
• 2017-2024 BMW X7 M40 G07
  
• 2019-2024 BMW Z3 40 G29
• 2019-2024 Toyota Supra 3.0L A90/A91