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There are two things wrong with a K&N air filter in a stock air box.
1. The stock air box is a lousy design, and tends to leak unfiltered air past the filter. That can be disastrous.
2. Too many people don't know how to maintain a K&N filter, so they screw it up.
There is nothing wrong with a K&N air filter, provided you are certain it fits perfectly in your air box so no unfiltered air can get by it, and provided you know how to clean and re-oil it using nothing but the right kind of oil.
I had one for about a year. I threw it away and replaced it with a much better intake system.
K&N now makes the big conical fuel injection performance kit (FIPK) intake system that replaces the lousy Ford air box. That's a good aftermarket air intake system, but again, provided you know how to maintain a K&N filter.
Much better is to install the new Ford Severe Duty Air Induction system (AIS). The only maintenance is to replace the filter every coupla years. About $200 steet price, and there is no better intake on the market for producing up to about 400 ponies from your engine.
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My Sierra Blanca in the sig pic was a great pickup for 11.5 years. I sold it last year. Replacement is a 2012 F-150 EcoBoost SuperCrew Lariat.
Last edited by SmokeyWren; 04-29-2009 at 11:30 PM.
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