most mild steel headers will rust/rot from the inside anyway. wrapping will yeah hold moister. there a bad idea on a leaky engine. if you were that worried about under hood temps get em jet hot coated. other wise just run em. even grill paint will burn off. not too much paint can handle over 1500 degrees.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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