I'd just go with the stage 2. I had the 2, it held up very nicely for all the abuse I gave it. The only thing i'd say is to stay with the stock flywheel. I had the ultralight with it and it was a major pain sometimes in daily driving in traffic. The revs drop too damn fast and coasting slowly was really jerky and tough to find a sweet spot on the throttle. Just also be sure to adjust ur CMC if you suddenly get lockout issues. I never had that issue but some people did.