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I don't see any safety/legality issues with it. It won't be anywhere near as hot as a tailpipe, and you can touch them easily enough... if you want.
However, I don't see the surface area of it being enough to do much. Might want to make an entire hood panel like that to get more area.
And having a pump- nothing is easier than adding complexity! Why not do thermo-siphon?
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