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      02-11-2013, 09:28 PM   #46
Merlosso
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Drives: Results
Join Date: Mar 2011
Location: Germantown, MD

Posts: 495
iTrader: (2)

I've always used K&N filters in my cars and I have one in my M3. Never had any issues. Wasn't expecting any power out of a drop in filter, just a little more growl. They are $70 shipped on Amazon. No regrets.
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