Re: Header coatings
Mileage doesn't always matter, it's cylinder temps, timing, how hard you run the car.
Most paint will burn off on the initial start-up and if not then, it usually doesn't last long.
Check out Hedman Hedders Elite series they are "thermal" coated which I'm pretty sure is a ceramic coating, they are pretty inexpensive and fit very well. Not sure if they'll work with Power steering or A/C.
Stainless is expensive but would look good under the hood of a show car, definitely don't want to run bare steel headers.
I've found if you buy a set of non coated headers, it's about $300.00 to have them coated in ceramic, so you'd pay more for the coating than you did for the headers.
Highly recommend ceramic, lasts a looong time, usually doesn't rust, takes the heat, keeps it in, looks good etc..
The only Mustang I'd ever own is a Fender.
'68 333" Camaro
'14 5.0 Mustang