er.. the STR forum at delphi is quite good, and there's a forum
dedicated to CBR too. from what i remember, K&N (the ONLY brand
i know of, sorry, limited knowledge) only manufactures
power-filters for class 2 bikes, according to their website. but
it's strange because some guy riding a S4 managed to buy a K&N
power filter for his bike. um... dunno if it's a case of fake
products lar...
try it... think most of the people there should be able to answer
your queries... http://forums.delphiforums.com/cbr400/start
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rock hard... ride free...