I think most people that do their exhausts do ceramic coating. Not sure how many people actually tried powdercoating and had no issues, but I haven't heard of any issues.
I am getting my Gintani ceramic coated black as well.
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel