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
'13 Toyota Tundra - 4x4 Platinum CrewMax, 5.7l iForce V8