I've always wondered if I hadn't had other modifications to my machine, if adding a K&N filter would make a difference. It is important! I immediately noticed a difference in performance and an improvement of about 0.5mpg. Having bought a cleaning and oil kit to go with it means I won't be changing the filter for a long time, so between that and the mpg increase I'll have my money back in no time, plus a bit more high revs. Street.
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