What about constructing a duct to direct all the warm air out under the rear bumper?
You have a bellypan that extends back and it is all sealed up except for a 4' by 3" metal duct that extends the length of the entire car with the muffler cat etc all contained inside. The fan could be moved to the rear of the engine compartment to blow into the duct. The cat and engine would warm up quick and the underside of the car would be smoooooth and quiet.
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