Purple powerbands from KOR attached to the third internal point in the header pipe will produce the maximum amount of power, RAG Engineering are the worst stickers to use they are un reliable.
theres a mod out there to get air and fuel into the upper cylinder quicker. you drill a half inch hole in the top of your piston. did it on my banshee once. wow, what a difference.
After you figure out how many pistons you have and replace the power bands you should port the cylinder. Take a sawzall and cut out the intake bridge. I does no good, just restricts airflow!