k&n filters

i replaced factory filters with k&n. was this a good idea>

no
sell them on ebay

K&N will cause a hp decrease in our bikes

BMC race filters are the only ones that I have read about that cause an increase

look up www.rogueracing.org.
or

http://hooliganbiketech.dynup.net/hondacbr1000rrweb/1000RR_frameindex.htm

both sites have write ups on the BMC