Hi, Jerry. As Ron noted above...our "coating" project was less than an impressive success inspite of the plasma spray (28,000 degrees) base coat of nickel then cubic zirconium/ytrium...followed by cermat(similar, I believe, to Jet-Hot).
Another IN/KY member tried a variation of this process on his 2001 Viper...coating everything from the Belanger headers (the factory "2000 degree Jet-Hot" coating had already flaked off very early !!!), collectors, high flow cats, and first section of the 3" Corsa cat-back exhaust...which did move the heat rearward...giving the same "hot tail pipe" that you describe. After a 50 mile drive in his 2001 and my 2001 side by side( mine being stock except for a Corsa cat-back system) we stopped and measured the exhaust gas temps at idle...and the coated system's readings were over 100 degrees higher...NOT a "good" in our opinion. When we later dynoed his car, it had a lower than expected HP as well for a "creampuff". Needless to say, we did not try any other extra coatings.