I was considering a slip-on (gixxer.com ruffin links is the best to look around). I didnt want to sink all this money into a power commander and getting it dyno'ed and blah blah blah. I discussed this with a couple people and they said that the bikes are blasted to the hilt with the stock parts on it, and any mods would throw off the mixtures and ratios. I decided to sink them money into cosmetics. When I build up the "bike fund" again, I will get a full exahust, the performance air filter, and get the whole bike remapped with a power commander. They suggest that you do all three things at once.