CTS Turbo Crossover Exhaust Pipe for G80/G82 BMW M3/M3C/M4/M4C S58 engine

CTS Turbo is proud to announce the release of our BMW S58 G80/G82 M3/M3 Competition/M4/M4 Competition Crossover Pipe, also known as intermediate pipe. One area that can benefit from improvement is the exhaust system's mid pipe design. The G80/G82 M3 and M4 utilize a Y-style mid pipe, with both downpipes located on the right side of the engine. The left side downpipe connects to a "crossover" pipe that runs beneath the transmission and links up with the mid pipes on the left side. Unfortunately, the stock shape of the crossover pipe is oval to create enough clearance underneath the transmission. This alteration from a round tube to an oval causes turbulence within the pipe, leading to a restriction in exhaust flow. We have developed a replacement crossover pipe that retains the round shape, eliminating the turbulence and restriction caused by the oval design. By doing so, we expect to significantly increase horsepower and torque, enhancing overall performance. Features:

• Durable 304 food-grade stainless steel, 3" or 76mm diameter
• Laser-cut flanges
• Designed using the latest 3D scanning technology
• LHD/RHD fitment
• Exhaust flow simulated with CAD software to ensure optimal flow routing
• Replaces OE part number 18328468990

Fitment:

• 2021+ BMW S58 M3/M3 Competition
• 2021+ BMW S58 M4/ M4 Competition

NOT COMPATIBLE WITH AFTERMARKET SINGLE MIDPIPES.

This part also goes by the following cross reference.

Cross Reference Part Number:

Fits These Vehicles 8 applications

M4

Make	Model	Engine	Years
BMW	M4		2021–2022
BMW	M4 (G80)		2021–2022

M3

Make	Model	Engine	Years
BMW	M3		2021–2022
BMW	M3 (G80)		2021–2022

M4C

Make	Model	Engine	Years
BMW	M4C		2021–2022
BMW	M4C (G80)		2021–2022

M3C

Make	Model	Engine	Years
BMW	M3C		2021–2022
BMW	M3C (G80)		2021–2022

Fitment data last updated: 2026-06-26