I´m not sure but I think there is a company called dynojet that sells stage 3 carb kits for this bike. Probobly about $100. The catch is that you need aftermarket filters and exhaust (maybe) unless you already have a pretty high flow system. There are some bikes that are already tuned about as good as they can be so getting this kit could make it worse. Things like that can be pricy but if you get it right you can get about 15% more HP. Good luck!