I know its a drive, but I got my headers done for my Mustang at a place just east of Knoxville. He coated them inside and out for $180 if memory serves me. They were done in less than a week.
Check 'em out.
http://www.amr-coatings.com/metallic_ceramic.html
I'm not sure, but I think there are two local places:
There's a place in Gallatin off airport road north and a place on 109 at the intersection of 109 and 70.