Ron,
I was skeptical of ceramic coating, but thats what we did with our header. It's an old clifford research that we sent to Jet Hot to have coated, and I can't believe how much cooler the whole engine bay is with it. I don't burn myself working in there any more. Significantly cooler than my uncles wrapped z header. He has some coated headers on his Datsun 2000's though, where I thought the coating was less effective, and the engine bays didn't stay all that much cooler than with an unwrapped, uncoated header.
Chris
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