David Cooley reported on a magazine test of aftermarket air filters. The paper filters were respectable, but the K&N and Accell filters flowed almost 3 times as much air when dirty as clean paper filters of the same size. The K&N passed less particulate matter than the paper filter; as it got dirtier outside, they sprayed on a new coat of oil (without cleaning) and found it filtered even better. Are K&N filters worth it? K&N filters change your engine sound, rarely need replacement, and flow better when dirty. Other than that, you may not notice much difference unless you have a high-efficiency exhaust and performance engine. |

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