I would do a search on Vforce reeds, Noss heads, timing plate, porting, pipes. That would be your best route to take off the bat...if not just read up on all the mods people have in their signatures and research from there, thats what I did!
www.farmandsandtoys.com has prices to give you an idea on the amount of money it's going to cost you along with pictures...Good Luck!