Designed in-house by Direnza engineers, our sports cat downpipe 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 Fitment BMW 3 Series F80 M3 2014-2018 models BMW 4 Series F82 M4 2014-2020 models Please note - This is a non type approved CAT and as such will not pass an MOT so is sold for off road use only.
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