My current 260Z header is wrapped and it seems just fine. The header is of beefy construction though but I've had no problem with the wrap and I think the underhood temps are definitely lower and more importantly the carbs/intake are cooler. Not seeing how a ceramic coating could achieve the same result with a 50 micron layer of coating on the header.

While I did have trouble with oil leaks on the old leaky Jensen motor that was more due to it's design than anything else.

Ron