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I cant imagine why the coating on the outside of the headers would directly affect exhaust flow inside the header, but thats just my reasoning. So its either more showy look under the hood, or aimproved sound coming out of the exhaust
its more show but the hts coating can easily be rubbed off and it can occasionally be burned through
its no big deal, jsut if u get the hts coated ones repaint then with several coats of engine enamel and u should be fine
ceramic is better tho if u can swing the price