Although I posted this clip in my other thread, it more properly belongs here. This is a clip of the 135i Performance Exhaust installed on my N52 128i. Stock resonators are in place and the only other mod affecting performance is the M Performance intake. It didn't sound that great after the first few days, but it has finally "broken in" and sounds amazing now, but only after about 4,000 rpm. Before that, it really doesn't sound special. Enjoy.
https://clyp.it/fubzhkzb