Active Autowerke BMW E36 Exhaust Track Pipe Back Section (B) | 328 M3The Active Autowerke Track Pipe is comprised of TWO main components. This is the SECTION (B) which is the latter part. If you install the Active Autowerke performance headers, but would like to run a rear exhaust like the BMW Factory; Active Autowerke GEN 3; Supersprint; Remus; or others, then you need the Active Autowerke Track Pipe SECTION (B). The Active Autowerke SECTION (B) bolts directly to the Active Autowerke headers in an seamless operation.