The Ceramic coating wont discolor at all under normal use on the street or track. Unless you break in your cam & the tubes glow red hot at that time. Then the coating will turn dull.
I broke in the cam on my Boat & about 8"'s of each of the tubes turned dull. I took a product called "Header Chit" to it & it returned it to glossy again.
My opinion is that the coating is a good thing to have. Because if it was just paint I would have had to repaint them, but it would have just burned off again anyway.
Ron
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