I'm going to do some motor work this winter and can't decide if I should do the Fuel moto 107" big bore with CNC heads or the HD stage 4 kit. What are the pros and cons of each? It looks like they will be about equal cost to install. I'm in MN so WI isn't an issue getting my bike to FM. Looks like the FM will give just a little more power. Interesting the Hd kit has larger throttle body, but the FM doesn't. Also, I think the HD costs for dyno would be more. FM install costs include dyno tune.