When I bought my FI LTH's, Tony advised me that if I was going to do something to trap heat, to go with the coating instead of a header wrap. His logic was that the header wrap would trap moisture (from humidity) against the metal in the mornings and lead to premature corrosion of the metal, it kinda makes sense.
Keeping the heat trapped in the LTHs btw, aside from possible keeping the engine bay slightly cooler, helps keep exhaust velocity higher as well.
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