Hi Stu,

Do you know if they ceramic coated the inside of your headers?

I had a set of TTI's that had to be recoated. I spoke to the place who coated TTI's headers. At the time, I learned that not all of their ceramic headers TTI offered, were coated inside.

I had another set of headers coated by Jet-Hot at their Phoenix location. They ceramic coated my headers on the inside. I can't recall if I paid extra or if that was included.

From my understanding not many of the new headers and those offering ceramic header coating automatically do the inside of the headers since it's more costly.

From what I've been told by these places, coating the inside provides an added measure of protection. Of course poor prep, which others have mentioned, may explain the problem that you experienced and not the coating itself.