Thread: K&N Air Filters
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Old 12-13-2009, 10:37 AM   #3 (permalink)
Daox
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Nope, I don't use em. It doesn't help at all if you are driving to get good mileage. Plus, they let more crud through the filter and can gum up MAF sensors with the oil from the filter.

Testing to prove it:
Testing a 'performance' air filter for MPG - Part 1 - MetroMPG.com
Testing a 'performance' air filter for MPG - Part 2 - MetroMPG.com
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