kn air filter - where are they cheaper?

Hi all, I've tried the K&N and was not happy at all, gas milage went down and the bike did not feel as though it was reving as quickly as the stock; this is with a atre and a pcii with hmf high mounts carbon.  When I instaled the BMC Race I felt the diff.  Here is the url to purchase one if you like.  http://www.factorypro.com/
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