Sounds like its going a bit ott to me, Internal coating is not happening on mine, i hear what he says about turning to dust if that is the case but i dont even like the idea of that, id worry about it killing my turbo no matter what they say.
I was not to bothered about leaving mine un coated and with no heat wrap in the first place, zirotec ceramic coating just on the outside will do me, i went with the performance black, manifold/screamers/downpipe, looking forward to getting the bits back so Lee can crack on with getting it back together, will stick some pictures up of the heat coating when i get it back.