Well, I've shopped around a bit and it seems I can get a local place to put on a thermal barrier ceramic coating inside and out the two manifold pieces and the two elbows for about $300. That's a coating that is supposed to be stable up to 2000 degrees. It only comes in a satin black, which is acceptable to me. I'll try and do before and after pics.

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I never go far without a little Big Star

1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k