best paint I found is BBQ paint that they sell at hardware stores. used it on my ram headers with good results and plan on using it on the headers for my 5th ave and exhaust manifolds for my dart
I used cast iron black BBQ grill paint from ACE hardware on my fenderwall Hooker's and it still looks great 8 years later and looks new yet. I think it is from Rustoleum? This works better than any header paint you can buy. I did not bake mine either, just painted them, then it was a few months before the engine got started and broke in, no burned paint anywhere.
I know of many people who use this, my buddy uses it on his motorcycle pipes too and they still look great, even after 10 years of use. Don't waste your time and money, go get the BBQ grill paint.