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Good point. And the longer you keep a K&N in ,the more dirt it accumulates and in theory the more efficient it becomes. But data doesn't lie. http://www.nicoclub.com/archives/kn-vs-oem-filter.html To obtain flow , one must give up efficiency. And for the majority of the population that drives...

Sacrificing filtration efficiency for air flow is ok on a race car. But I don't see the benefit on a daily driver. No K&N air filters in my cars anymore. Besides, the biggest obstruction in the intake system is the throttle plate.