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Yes, the coroplast does eventually melt, but only in the immediate vicinity of the exhaust pipes.
In all of my years of ecomodding, coroplast has never caught fire on my cars.
I recently removed my rear diffuser, I'll take a picture to show how much of it has melted away. It's not very much.
If you want to be safe, I'd leave a 2-3" gap.
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