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With the ProMX You get all the Low end Performance increases of the Stage II, with the revolutionary Pro-MX porting, Stage IV head modification with turbo mod that gives you 95% of the Stage IV power on the top end. The ProMX comes race ready with a Stage IV pipe & silencer, complete 38mm PWK race carb kit with velocity tube, K+N filter and wrap, reed spacer, precision bore, and power hone on your cylinder, Trinity's exclusive Wiseco Piston with a Stage IV modification, bulletproof wrist pin bearing & top end gasket kit.
