Coating the pipes with a heat resistant material does a couple things. First it keeps more of the heat inside the pipe instead of radiating out on you. Second, keeping that heat in the pipes helps keep exhaust velocities up which in turn helps the scavenging effect. Oh, and thirdly it keeps the pipes looking better longer.
Jerry
As usual Jerry is right on all counts.

OK. That all makes good sense, and sounds like a definite path forward toward my goal of reliability and longevity. Is the process "done" to the inside or the outside of the pipes........and if it is done to the inside, doesn't the resultant decrease in ID affect flow by restricting it since the area through which gases must travel is now smaller? I'm just asking since this discussion has brought out the analyst in me. Thanks.
One more thing.........Rod may already have plans to do this......I just have to ask him..........but if he doesn't, who does this type of work, where are they located, and what is the cost to have the work performed on a D&D Fatcat?