Check out the Cerakote website - for their high-temp ceramic coatings. I've used them for headers on a variety of race and street cars. The key is for the media blasting to be done correctly (and don't touch the material with your bare hand) - and then put them in a BBQ and bake the coatings on at about 500 degrees. Once you do this, the stuff is pretty darn tough.
https://www.cerakote.com/shop?msclki...ontent=General