We have an election coming up soon and, Lord knows, 4X8 sheets of coroplast would be much better used doing something useful like aero modding your car....
Consider use of framed aluminum window screen to cover the hot spots. Dissipates heat, lets cooling air out, still gives a comparatively smooth surface for the airstream beneath the car, vs. bumping along the sharp edges of mufflers, etc..
The coro will tell you if too hot from a tailpipe, etc., by discoloration and/or distortion. Either trim that area back and/or apply aluminum foil tape (like duct tape) to nearby areas to reflect and dissipate such heat.
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