they make ceramic powders so heat wont be a problem..so far everything ive coated has been fine ..what system and powder you using..?
i was going to do the head pipe heat shield but decided i needed some chrome..post up a pic when your done should look wicked.?
I powder coated mine...
First time i started it they discolored a bit...not bad..just darkened it a few spots a bit...
I think my issue was with the gloss brass color I went with...If your going Black...I don't think you'll have an issue...
I had a set of chrome V&H Bigshots done at Performance Kote in Orlando. I had them done in flat black. They look great and are so easy to keep clean. I couldn't recommend it more.