I have a 2005 TSX 6mt with CAI/CATBACK EXHAUST/Hondata Reflash
I believe that adds up to at least +25hp at the crank,
torque is greatly improved, dropped VTEC engage point to 5k instead of 6k, and fuel cuts at 7600 instead of 7300,
now that's a much much wider band of high cam profile, and if the revs are high enough for each shift, ALWAYS IN VTEC.
definitely makes the TSX into a Quick Car, to say the least, not to the point of Fast and furious, but enough to take on IS300/IS250's no problem.
I've also kept up with a RSX-S from 40-90mph (he had AT LEAST intake and exhaust, heard intake, saw exhaust)
I tried it with the rsx-s from a dig too...but I don't know how to launch that well, and the torque wasn't enough to push my heavy car faster than the little rsx
but I've literally KILLED IS300's before, their V6, especially mated with the 5-speed transmissions they offer, has NOTHING on the reflashed K24
anyway, if I really wanted to race, I would've gotten a EVO, but the TSX is something you can enjoy modding while you're young, and still retain the style and everyday friendliness even after marriage...
love my car!