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I think of heat and pressure as being roughly equivalent in re exhaust systems. A Corvette with a typical small block Chevy will benefit from a larger diameter dual exhaust system where a long pickup truck with the same motor will be just fine with a single decent diameter single, all due to length.
Have seen Japanese cars with outer shell exhaust pipes: inner pipe runs exhaust, outer shell insulates. Problems with rust.
There are formulas out there about this subject, generally for racing, but it's been years since I read them. All I recall for purposes of economy (reason I read them) is that there is a fairly quick decrease in benefit past a certain point (depends on vehicle, use, etc).
SWAIN TECH and others will coat pieces to help retain heat (expensive; not just cosmetic), and there are companies that specialize in turbocharger "blankets" and the like (also not cheap).
Might be worthwhile to make marks on the current exhaust system and take a series of temp readings under normal conditions. Records. See if some of that info above can be found. David Vizard would be my first guess (a gifted writer on autp race tech subjects).
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