Hmmmm ... check this response from another forum
>Had an engine on dyno, ran engine with K&N and then with stock filter, same
power. George B.
Pretty direct bloke and not too talkative ol' George.
Anyway, from what I've read and seen here, I'd put the claim of increased HP from K&N in the same category as that from Octane Boosters, High performance fuel additives and Horny Goat Weed (how'd that get there) ..... great marketing and nothing more!! A bit of "the emperor's new clothes" I think where people tend to believe what everyone else says without thinking. Personally, I've tried them all (except K&N's) and haven't noticed anything to write to the post about ..... the emperor's naked people !!
Having said that, I might wear one at shows as I think they'd look good against my red paint but that's about it ...
Thanx for your responses ...