However, here is a smaller outfit that is in your neck of the woods. You might want to try and hook up with him. Web Page is:
http://www.engineceramics.com
My first choice is HPC-Performance Coatings:
http://www.hpcoatings.com
This outfit is top notch, with multiple facilities across the states. Be advised that this is Ceramic/Metallic coating as opposed to Powder Coating. (Powder coatings treated at 400 degrees where Ceramic is 600+ degrees. I talked to the plant & General Manager in Utah yesterday. They actually have engineers on staff. Jet Hot made me nervous when they couldn't answer my questions about cast aluminum manifold integrity after subjecting it to 600 to 650 degrees for 1 hour. Aluminum melts at 1230 degrees. Common sense says you HAVE to LOSE some casting integrity. Jet Hot also stated they have NO process engineers on staff that can address these issues or answer technical questions regarding the "downside" of Ceramic/Metal coating (nor have they ever had any). I get the impression they basically copied the process from HPC. They kept saying; "we do plenty of manifolds" which is fine but doesn't answer my questions. J-H has marketing but if you want to know statistics regarding integrity, rigidity, heat deflection, insulating properties, porisity effects, etc. they got no clue and basically it's your problem later. J-H also does no masking on gasket surfaces, which means they coat the whole component and appently are not interested in the labor time. Typically it's a .003 thick coating, and I'm not sure how that effects gasket mating if there is any uneven flow. HPC was upfront in indicating there is approximately a 20% loss of Aluminum Casting integrity after coating processes is completed and their process is analogous to Jet Hot's +or- a few degrees as well as proprietary compound mixes. They indicate that its not enough of a loss to effect threads subjected to bolt torque under "normal" conditions. HPC was very informative regarding improving the coating process via casting preparation, coupled with the pro/cons of Ceramic Coatings. I was appreciative of their knowlege and candor. It won't effect your specific requirements regarding headers because your not dealing with aluminum, but I have a feeling that some of these guys haven't done all their homework regarding manifold coatings. HPC has significant experience in the aerospace as well as other markets which gives them a major edge in my book. I'm weighing the risk/reward right now. I want esthetics as well as heat insulating properties but I'm not to keen on giving up much casting integrity. Too much money involved here, just to be slick. Same old Sh*t; you give up something to get something. BTW: I'm only stating facts that I learned in the last week. I have no allegiance to any of these outfits. Hope this helps you. If anyone else has anything to add, I'd appreciate hearing it too.