« Reply #9 on: May 09, 2012, 12:42:42 PM »
K&N filters do perform better than oiled foam filters in terms of filtering (preventing dust and debris from entering the engine) and in performance since air flow is straightened and less restrictive, allowing more air into the engine. However, they are more susceptive to water and large particle clogging (mud).
An additional problem is with marketing. K&N sells air filters "for the life of the vehicle". This is misleading. In cars, they figure the life of the vehicle is 150,000 miles - and that is for on-road use. In addition, most users don't do the required maintenance "clean & refresh" as required. You may clean your foam filter every ride but most people replace and forget, thus eventually losing performance and possibly damaging their engines.
Don't use the excuse "that's what the Pro's use". Pro's would wear women's underwear and ride Chinese pogo sticks if you paid them.
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