About 10 months ago I painted the exhaust side of mine with POR-15's cast gray high temp maniford stuff and so far it still looks great. I spend most of my time on the street and prob only have 3500 miles or so on it, but a few long trips, one to VA, so I have built some heat on it. I'm not too sure how it would last on a car that sees 25 psi on race gas every weekend.