There is (was?) a real good specialty coating shop in Irving that has done a lot of motorcycle headers and special cylinder coatings and etc. in the past for me but I haven't used him in a long time. IMO his work was better than HPC. He has a ceramic exhaust coating that looks just like polished aluminum.
Renegade Performance Coatings
453 N. Briery Rd
Irving, TX 75061
972-399-0132
Bob White, owner (one man shop)