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Originally Posted by rayxi
I'd be interested in reading about the tests that show that if you would be kind enough to post the links. TIA.
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http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
http://bobistheoilguy.com/airfilter/airtest1.htm
If you go throught the used oil analysis on the same website (1000's) you will find that nearly every time there is high silcon in the oil (a sign of dirt) it is a result of a K&N air filter.
The marketing of K&N is great, the real world results are not so good. Run OEM air and oil filters if you want to maximize your engines life. Believe me, if there were 5 free horsepower to be had by running a larger air filter, the auto manufacture would use one.