BMW 4 Series F82 M4 14+ 200 CPI 3" Sports Cat Downpipes

Designed in-house by Direnza engineers, our sports cat downpipes are a direct replacement for the stock catalytic converters. Engineered to not only improve power and torque but also throttle response on the S55 engine. 3" Diameter downpipes for maximum gas flow giving optimum performance increases Replaces the restrictive catalytic converter allowing you to gain more power from the S55 V6 engine TIG welded from T304 stainless steel for maximum strength and rust prevention Designed to be a direct replacement for the OEM catalytic converter Built in Flexi's reducing any strain on the exhaust system May require bypass software on vehicle ECU.