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Discussion Starter #1 (Edited)
the previous owner of my r1 installed a k and n filter but i acutally read that it takes away from hp i thinking about going back to a stock filter but that means rejetting. how much hp does it actually take away if any. I dont know if its worth it.
 

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I've never heard of this problem, but I don't ride an R1.
I have several friend's who do and they use K&N or BMC w/ no loss of hp...minor gains if anything.
 
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