I'm all for coating the manifold, turbine housing and dump.
I won't wrap exhaust, if it's too close to another component I would shield that part first.
I also have wrapped and covered in foil tape intake piping and intercooler return pipe depending on the situation as said earlier to keep the hot air out.
I have just replaced and upgraded a gt35 on a gu petrol patrol where beanie, heat Wrap braided lines cooked everything. It all went in the bin along with the near new turbo but that's another story.
People seem to like touching turbine housings straight after a drive cause they radiate nowhere near as much heat after being coated.
That's just my experiences though.