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      01-17-2013, 07:55 PM   #2
Private First Class

Drives: 2012 135i
Join Date: Sep 2011
Location: San Francisco

Posts: 170
iTrader: (2)

I've got the berk street on an n55 and it is the perfect compromise between noise and performance if you ask me. The turbo spools slightly faster, and you can hear it over the engine if you are in to that sort of thing. Berk exhaust is ~40 pounds or so lighter or more than the OEM (75 lbs stock weight) and has a smoother tube and internals.