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Mild DIY PE-type mod. Since I had the exhaust off anyways, figured I'd knock this out. This is an N54 135i muffler I picked up off gixracer a while back. I opened it up and sealed one of three holes, and covered about half the holes in the perforated pipe. Extremely mild, if I were to do it again I'd cover 2 of the 3 holes. But, better to undershoot than overshoot in this case. I frequently bang limiter at 5:30AM, and I like to keep a low profile. I also like to hear my car, and this absolutely helped. Also conveniently only added an extra hour and a half to the job, super worth it.
Rest of my system is bone stock. I tried headers one time and un-did it because they were just too damn loud, and BMWs make better induction noises than exhaust IMO. I think I have it just about where I want it now.
My welds are not the prettiest, but they get the job done.
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