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Old 09-03-2009, 01:17 PM   #13
mvrk10256
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Join Date: Jul 2009
Location: Austin, Tx
Posts: 3,904
My Ride: E30 325i
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K&N drop in filter. lifetime filter, just oil occasionally. protects your engine but is less restrictive then stock filter.

the thing is unless your engine needs more air ie supercharger, you are just fine witha drop in replacement.
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