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I was first hand witness to a test set of headers debating the merits of this. 1&3 tubes were coated, 2&4 were not. 1&3 ran at around 650 surface temp while 2&4 were over 900 on the IR gun. I was sold instantly. I dont have ceramic headers because of the cost, but they're certainly awesome. More heat in the exhaust is a good thing, and less heat on the tube is also a good thing. It's a win/win
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