Add the SE exhasust, and stage 1 air cleaner kit. This should give your a gain of around 15-20 HP in the midrange area. The most noticeable area. I can drop my bike down from 5th the 4th and whip buy and pass a car on a two lane road now much quicker now. If you are going to add exhaust just find a good blance b/t power/torque, and loud. I love loud, the louder the better, but I will sacrifice loud for a large decline in torque.