this has been said a lot but, boring does virtually nothing to gain power. Pipes, porting and eventually stroking are the three serious ways to gain power. I really don't know much about the powerup kit, but i'd say get a good set of pipes that fit your riding style, if you don't have any already. Then get some portwork done, and then finally stroke that bad boy. Of course, in between these big steps, you can throw on a Coolhead/Noss head in between for compression, and some reeds, and a timing plate, and an ignition, and a lightened flywheel, and a Toomey 2:1 air intake, and a boost bottle... need i go on?