FabSpeed BMW M3 & M4 F80 / F82 / F83 Primary Cat Bypass Downpipes

Eliminate the heavy and restrictive factory catalytic converters with straight-pipe, high flowing stainless steel downpipes for maximum power and an exhilarating sound.                                                                                                                          FEATURES: Fits all BMW F8x M3 & M4 vehicles (2015+) The perfect option for track cars and those who seek the ultimate in agressive exhaust sound Mandrel bent pipes with minimal welds to minimize failure under regular use and increase flow Designed to fit seamlessly with the factory exhaust system, or as an add-on to Fabspeed's Valvetronic Exhaust System.  (Also compatible with any other aftermarket exhaust system that is designed to fit like OEM.) Replaces the restrictive factory catalytic converters with a straight-through "straight-pipe" design for maximum power and exhaust sound. This product replaces the factory catalytic converters and may trigger a Check Engine Light.