I've wrapped all the hot side plumbing going into and out of the turbo. From the manifolds to the turbine. Have a turbine blanket on there too. Wrapped the downpipe as well. Keeps the heat in and away from my wires, hoses, compressor, and blah blah blah. I can tell ya when I had banks turbos on both my IDI's, the wrapped plumping spooled the turbo quicker on the crew cab than the unwrapped stuff on the F250.
Keep everything wrapped when I swapped the GT3788R on the crew cab. Still spools quicker than the Banks in the F250 and that Garrett is a heck of a lot bigger.
Heath