E46Fanatics - View Single Post - need help picking the right air intake system
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Old 09-03-2009, 01:17 PM   #13
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Location: Austin, Tx
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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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