304 Stainless Steel Cat-Back | BMW G8X M3 M4

Midnight Manufacturing 304 Stainless Steel Valved Cat-Back Exhaust System | BMW G80 M3 & G82/G83 M4

The Midnight Manufacturing 304 Stainless Steel Valved Cat-Back Exhaust System is the ultimate acoustic and performance upgrade for the BMW G8X M3 and M4 platform. Engineered to resolve the platform’s factory sound shortcomings, this system delivers a commanding exhaust note that transforms the S58’s character without introducing unwanted cabin drone.

Constructed from premium T304 stainless steel and TIG welded for maximum strength and a flawless finish, this system features enlarged 76mm mandrel-bent piping to optimize flow and reduce backpressure. The integrated valve control retains factory functionality, allowing you to switch between a refined, deep tone for daily driving and an aggressive, straight-pipe experience when performance is demanded. Whether valves are open or closed, the exhaust is tuned to provide a fuller, smoother soundtrack that enhances the driving experience on both street and track.

Finishing off the system are quad 4.5" (114mm) double-walled tips, available in a beautiful stealthy black, designed to perfectly fill the factory cutouts and complete the OEM+ aesthetic with a bold visual and audible statement.

IMPORTANT:

Please note that all Midnight Manufacturing products are typically made to order, with delivery times of 3–4 weeks.