R3Tex
Living Legend
Decent exhaust (CES, Viking, Carpenter, Reband, etc), rip out the stock intake system and put filters directly on tue throttle bodies (K&N, Ram Air, etc) and get a good dyno tune and you are in the 170 RWHP range with absolutely zero loss of streetability. If you still want more then skin out somewhere between $6k and $10k and either send your bike to carpenter or call TTS. Both options have been discussed at length on this site. All depends on the strength of your pocket book and what your want to do with the bike