Yeah, I'm not so worried about the manifold as I am the turbine housing retaining heat. And as far as coating the inside of the manifold/turbine housing...I'm not going to do that. If that stuff starts to flake it goes right into the turbo. Here is a quote from dsmtuners, "4k miles old. Developed in and out play but no side to side. Sent it back in and they said it overheated or something. Blue on shaft. Subsequently, they lost my turbo along with the turbine housing.". I'm just scared of coating the housing and having the same issue and killing a turbo. Manifolds/downpipes I have no doubt, I want to get them done but the exhaust housing...well see I guess. Thanks for the replies so far.