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Radiated heat is lower in my opinion. I know that my side pipes are not as hot as the old chrome set I had. I plan to run regular headers and exhaust out the back and I will have them all Jet Hot coated, at least back to the axle.
I think the thing that did mine the most good was the metal stone guards that are under the floor pan and up the bottom part of the firewall with 3 Reflectix layers between them and the floorboard. I also have Reflectix under the carpet.