What excactly the difference is on the engines i dont know, they have the same comp. and bore. All i know is that all the EXC models have about 75hp and light weight, you dont need to worry about not enoght power trust me. Like i said before it lifts on all gears if you like doing wheelis... We came far out from what he asked, cheapest is exhaust, dynojet, standard high comp, camshaft with springs for the valves.
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