Personally, I am big fan of the Jet Hot stuff, it GREATLY reduces the temperature surrounding the tubes, most noticeably in the header area. I really couldn't believe the difference when I had my headers coated, the stuff is really that good. I wish I would have taken some before and after temps, but you can't do it with a tire pyrometer (due to the dramatically different emmisivity factors for the steel/jet hot), and I don't have a contact probe that'll handle that heat. Beyond the looks, it is very functional.
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