Regardless of who coats your headers, you NEVER want to break in an engine, or dyno an engine with a with a set of polished ceramic headers. Polished ceramic is only rated at 1000F - 1100F metal temp which translates to around 1200F -1400F EGT. Improper fuel or timing will dull out a set of polished headers in literally a minute or two. Once they get hot enough to dull, the pores open on the surface of the coating and the headers will begin to get rust spotting shortly after. The headers below had a 2000F thermal barrier on the ID and still dulled in a few minutes due to a lean start scenario....

If they're coated with a high temp ceramic, i.e. 1800F - 2000F this isn't generally a problem.