Had stage 2 done by Wick-it and all I can say is-----what a difference. Normal riding and throttle openings don't seem much different than stock. But get serious and it comes alive and normal cruising the engine just seems to be to be running so free and easy. The gentleman at Wick-it describes it as being "light on its feet."
Because of a lot of rain and other obligations, riding time has been limited, but so far I don't regret having it done. Knowing the extra performance is there if needed is nice.
My only mod is an Akro muffler.