I have a 2007 and I was looking into a stage 1 kit and then I saw a stage 7 kit and now I don't know what to do. Are there stages 2-6 as well? Never heard of those if there are. What is the benefit and difference of a Stage 1 kit and a Stage 7 kit? I think the Max has plenty of horsepower but could use some torque so I'd be going for torque. Also, what is involved with installing the kits? Is it done with the carbs still on the bike? I have a nightmare vision of dropping a jet into a carb...