Seacoast_Benz: I like your approach to :
: Hard Data, facts, proven results.
Too many people are too easily influenced by publicity, hear-say, promotions, looks good approach and spend considerable sums of hard earned cash on frizbees with no real value.
My opinion on ceramic coating: ceramic is a very good insulator (the shuttle is a good exemple). But, IMHO, the thickness of an exhaust coating is so thin that it would ahve a very limited insulating factor.
I wold think that in order to reduce the temperature under the hood, efforts (read: money) would be better spent at dissipating the heat, like adding loovers (see the front fenders of 300- diesels), remove/cutting the underbelly cover, or finding ways of increasing the air circulation under the hood.
JackD