in order to get full gains from a k&n filter like a RC1060,R1100,one has to

1.At least upjet the carb,the main Jet with at least a +2 size,there is a procedure to check which jet is optimum,i'tt post if someone wants to try.
2.Either, a bolt on free flow (Joel's work ) not the road sode dabba cans
3.Or,Get the head worked on,since there is more fuel/air one can shave an mm safely from the head,work on the intake and exhaust ports
4.on a 200+ cc bike all of the above will yeald upto 1~2bhp increase,but importantly,the way the bike revvs will be something to die for....

Thanks for the info bro..