I'm not sure on the longevity I high temperature powdercoating, maybe stage 6 uses this on their setups and knows more. But I would think the thermal expansion and contraction cycels would make the powder coating flake off. My research in college was thermal Barrier coatings used in gas turbine engines and this is the main problem with them...along with oxidation. Maybe someone else with more experience with this will chime in.
Haha yea I will be the lab rat and let y'all know how it goes I should get the jeep back Friday. I have pics of the headers and tips just don't know how to upload from my phone?