yeah i have seen the tests from K&N
showing the volume of air flow and all that
yes their testing is very well done
but is it true?
could be and most likely is
but at the dealer i work at
and stand as a tech
i have found machines run richer with the K&N (yeah some of the K&N was used but clean. K&N claims life time warrenty so that shouldent matter)
i had a guy put a K&N filter on his yamaha warrior and then it would sputter and beg for air. with the filter off it ran fine (this was a new K&N with about 5 mins of sputtering warrior sucking air threw it)with his stock filter it still sputterd. but then we cleaned it with solvent (we knew it was rich by the plug)and with the clean freashly oiled stock foam it ran fine.
but he was looking for something better than stock (reason he bought K&N)
so we sent him out with a new UNI and he was happy and it ran fine.
thats the worse case of a K&N i have had.
we put a K&N on a all stock ltz 400 and it ran richer than stock (both new, it was right after the guy bought it he wanted the K&N installed when he bought it)
but some people buy K&Ns from us and say they love them.
i just havent seen any improved air flow from them and they filter less
but that dosent mean im right. just havent been lucky with em i guess
and another u said K&N aint just a kid saying whats better
i am 38
but no im not professionaly testing
and im not able to say whats better
just whats better in my opinion
but who care really
what ever works for what machine really