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Take off the camshafts, cam chain, and valves, then cut holes in the cylinder, about 10-12 of them. Your ready to go.LOL Just joking around. Not anyway I can see to make it even close.
You haven't listened to some of the new four strokes if you don't think they sound good. I just bought a YZ450 with a procircuit slipon and it sounds wicked when you get it up around 10 grand.