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I wonder this very same thing but am afraid to dig out my heat transfer book. Which was the higher priority? I don't think the bellows can be ceramic coated and I also am guessing the ceramic coating is cheaper than a complex assembly.
The bellows is a must for longevity.
No matter what system, the heat has to go somewhere. Maybe the OEM heat shield is more of a heat management sytem. Which heat transfer mode is the most significant? Is it radiated, or convective?
so many questions...
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