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"Sterling" coating, and not ceramic, and I did three set of DP's, not exhaust manifolds. I was always very satisfied with the results although I posted here many years ago, that no one has "proved" the benefit, meaning an improved measurable outcome from these coatings. They have some claim to changing temperatures but not improved performance where the rubber meet the road. I did it because I believed it made the parts more durable, and the DP's were such a PITA to get to, I wanted them to outlast the engine
"Straight-line acceleration is probably the first aspect of automotive performance that any intelligent driver gets bored with." Peter Gregg "We owe a lot to the dragsters. They always break something, figure out a way to beef up the part and then the benefit trickles down." Robo "Not everything that can be counted counts. Not everything that counts can be counted." Einstein
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