Active Autowerke BMW S58 G80 M3 G82 M4 G87 M2 Downpipes w GESI CATActive Autowerke BMW M3 M4 S58 Catted Downpipes Active Autowerke is proud to release the advanced Active Autowerke Signature Catted Downpipes with GESI G Sport cats for the BMW G80 M3, G82 M4 and G87 M2. While these cars have received rave reviews for their performance, the sound is a muffled one leaving the driver to wonder if they are really driving a BMW M car. In order to solve this, Active Autowerke has created a full exhaust system for the G80