Coroplast is made of polypropylene, which has a melting temp of 340F (173C). I have it within 2" of exhaust components from the exhaust manifold to the catalytic converter and within 1" of the muffler where the exhaust temps have cooled off a bit. I used aluminum sheet (roof flashing) for portions of the underbody that are closer to the exhaust system. The main consideration around the wheel/suspension area is to allow space for the full range of movement of the suspension and the lock to lock pivoting of the front wheels.
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