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Thread: K&N Air Filters
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post #5 of (permalink) Old 09-23-2013
winkosmosis
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Joined: Jun 2013
Location: Houston
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They don't filter nearly as well as paper filters. I don't mean slightly worse, I mean 40x as much dirty gets through. That's because the pores are much bigger to allow less restriction even with a smaller surface area (due to fewer pleats). Googling will turn up some experiments that show just how bad they are.

Either stick with a quality paper filter in the stock airbox or buy the Ford Racing CAI which uses a disposable filter.

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