you'll probably want to keep the quad's rad setup since the water pump, tubing/flow rate, surface area etc is designed for the engine. The CVT is a toss up. quad engine is larger, so more power and the cvt designed for that--however, quad is lighter so that's taken into account in the design as well. I'd look long and hard at the CVTs and figure out which one can handle the power and weight of the buggy the best.
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