The BMW E9X M3's factory S65B40 V8 exhausts through a stock X-pipe carrying two sets of catalytic converters — primary and secondary — making it the single most restrictive component in the entire exhaust system. The Macht Schnell Stainless Steel Race X-Pipe removes all four cats and replaces the entire assembly with a catless, resonated design that flows freely from the headers to any axle-back exhaust, factory or aftermarket.
Built entirely from 100% stainless steel with twin resonators to reduce excessive drone without neutering the exhaust note, the Race X-Pipe installs via factory bolt locations with replacement gaskets and hardware included — no welding, no permanent modification, fully reversible to stock. Aftermarket ECU software or O2 spacers are required to suppress the check engine light from deleted O2 sensors. Not CARB exempt — not for street use on California public roads.
Brand: Macht Schnell
Fitment: BMW E9X M3 (2008–2013)
Engine: S65B40 V8
Construction: 100% stainless steel
Catalytic converters: Removed (catless)
Resonators: Twin — drone reduction
Installation: Bolt-on using factory locations; gaskets and hardware included
CEL suppression: Required — ECU tune or O2 spacers
CARB compliance: Not CARB exempt — not legal for street use in California
Reversible: Yes — returns to factory spec
