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Message: [QUOTE="Charles, post: 79231, member: 103"] Two main reasons... One... most people are dumb. Yep. Most people don't UNDERSTAND the point of the damn coatings. They are thermal barrier coatings. That means that if you place them on the inside of the piece, they will contain the heat just the same, yet do so BEFORE it reaches the part itself, as opposed to doing so after. Secondly, if you put the barrier on the exterior of the part it then becomes a barrier to the ability of the PART to radiate away it's own heat, causing the average temperature of that part to increase, sometimes dramatically. And with increased part temperatures you get closer and closer to the point where the service life of the part, based on material used and loads imposed gets shorter than what's acceptable. Instead of 20 years, it might be 5, or 5 months.... or if stressed hard enough, 5 minutes... This is also what wrap does, but it also adds the bonus of kicking corrosion in to high gear. This is why ANY major header manufacturer will 100% void your warranty the SECOND you wrap their parts. They're tired of warrantying other people's mistakes. Second reason you don't see internal coatings more often.... most people don't use ceramic coatings for their "ceramic" coatings, lol. Most of them in the 0.002" thickness are really just a high temp paint for the most part. If this is used on the inside it will flake off and be gone in no time. Then they will be faced with redoing someones parts again and again, as well as possibly lose business over it.... so.... they say F it and just don't do it. However.... SOME of them actually use ceramic coatings, or at least CAN... and IF these people ALSO have a pair of nuts in their pants, they can blast the good sh*t into the ports or ends and then swirl the part all around and coat the inside with excellent coverage. And I have YET to see the stuff flake and I've been running it on the insides of parts for 3 or 4 years now. The stuff my guy uses is called "white lightning" IIRC. It's f'ing thick. Looks nothing like the sh*t that people put on the outsides. Lastly..... I don't thick there's as much radiant heat leaving these parts as everybody thinks in the first place. I had a 304 SS pipe leaving the GT47 that ran within 1/8 of an inch from my PLASTIC heater box for literally 2 or 3 years of hard daily driving, including heavy towing and it never showed any signs of an issue. [/QUOTE]