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So, where does the engine and exhaust heat go? Is it sucked out through the gap between front and back sections of Coroplast, or past gaps around exhaust pipes/mufflers?
Couple of thoughts:
Near heat sources you may suffer some Coroplast melting. Time will tell, but you could add edging to the Coroplast in the form of aluminum foil tape. This would seal the edge, keeping moisture and crud out, and be a good way to dissipate heat from any hotspots, aluminum foil being a superb heat conductor.
If you need to stiffen the Coroplast, insert thin dowel rods from a lumber yard. Alternatively, use L bracket or extruded aluminum, orienting it to act as flow fences to shunt the under-car airflow gently out to the sides. Google for Ferrari aerodynamics.
What has this done for fuel economy so far?
What about noise level in the car, at freeway speed?
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