[Super Bleeder!!]

Why wouldnt you coat the inside? If the inside was coated the heat would have less of a chance of being dumped into the turbine housing metal.

All coating the outside of the housing will do is make sure the turbine housing cant radiate heat into the engine bay, because most of the heat will be trapped inside the material.

imho, from a logical standpoint if you are going to coat it at all coat the inside.

input from others welcome.