What kind of ceramic was on the pipes that were wrapped?
I don't know the specific coating used. It's a black coating rated to 1800 degrees. I did notice the areas of the pipe that weren't wrapped looked fine, but the parts the wrap covered looked pretty bad. I might have a picture of the damage at home if you're interested in what it looked like. I'm out of town for work though and won't be able to post it until next weekend if you want to see it.
Before I wrapped the pipes, I had seen another post or two (possibly on another site?) warning that rust could be a problem even with ceramic coated pipes. I think they said something about the wrap holding moisture against the pipe, and then it turns to steam from the exhaust heat.
At the time I wrapped my pipes, I was mostly interested in protecting my BSR from the heat and thought that the ceramic coating would be able protect the pipes from rusting. But I guess that's experience -knowledge you have after it's too late!