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      02-08-2013, 01:48 PM   #11
Lieutenant Colonel

Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

Posts: 1,722
iTrader: (3)

I have been running a K&N for a year. No issues. Can't tell you whether it adds power, but it probably does in my case since I have a 2008 and the original filter had the extra charcoal liner. It did change the sound a little and I like the slightly louder induction.