I love bikeman products. Their clutching is also bang on. Id consider the stage two performance kit. I think I'm turboing mine otherwise I'd already have it bought. Call up jimmy at bikeman if you have any questions. He's an A-1 guy, no bs.
love there stuff i have there stage 2 on my 2010 M8, I deal with cory micku form sled necks hes testing all there stuff here on the west coast he will help you out with a good kit...
Bikeman is great. I had a full big bore performer kit, can, pipe, y pipe, u name it. Never had an issue , and Jimmy is good to deal with. Great product