Here are a few videos from a Bimmerpost member who had his M-Performance Exhaust installed in his vehicle. In these videos, the Stock exhaust (first Car), the Bastuck Exhaust (second , with 1 M Front) and the M-Performance exhaust are compared and for the first time we can actually notice the difference.
Drive by with about 3500 rpm
[youtube]http://www.youtube.com/watch?v=QR-N_HPUjzQ[/youtube] Hard acceleration [youtube]http://www.youtube.com/watch?v=OcHKeQzkbHI[/youtube] Drive by with 3500rpm and lifting the pedal to get backfires. [youtube]http://www.youtube.com/watch?v=kbbRzL5vQMg[/youtube] All Three Exhaust revving [youtube]http://www.youtube.com/watch?v=KeSk0xISGzs[/youtube]