-what's with the ceramic-coating of headers (ceramic or porcelain like on quality stoves and vintage '30's motorcars is a glass-based substance and is primarily just for appearance, beautiful in blue on Cadillac/Exh.-manifolds), --however for ideal performance advantage, if you have your tubular-steel or cast-iron Exh.manifolds "liquid-hot plasma aluminum-sprayed" necessarily "inside and out" you will eliminate thermal-radiation from the headers to the extent that you can safely touch'em with a fully-warmed-up engine running (effectively reflects-heat like a mirror); --thus they claim added power and fuel-mileage, plus the bright/aluminum-coating looks spiffie as well while greatly extending the life of ordinary steel-headers as well! Here's a Specialist-website for additional info. on the particular Bright-coating (reflective, if you insist upon surface-blasting inside/outside, --they should last you a decade, probably much longer)--
http://www.jet-hot.com and weekdays 800/432-3379 for tech.rep & pricing.... ; --get my external-only/alum.-coating work done in So.Calif. by- FlameSpray-Inc. --619/283-2007. --website:
http://www.flamesprayinc.com/ -but they do NOT do the vital internal-coating! If you wish to buy a set of Exh.headers pre/aluminum-coated, just make sure that they are double-coated (that is both inside & outside), --that's the trick....
~Bob vH