Pdad nailed it. Some parts you want to hold the heat in, others you want to prevent it from getting in.
The intake pipe is something you want to keep from being heat by other sources. You need to figure out if it'* getting most of it'* heat from the TB or the crossover pipe. If it' the TB, you want to use a heat transfer paint on the intake pipe. If it'* the crossover pipe, you want to use a heat-insulative paint or wrap/insulation.
Most high temp paints will only prevent erosion/peeling at high temps. They have no insulative or heat transfer properties.
I use a ceramic heat transfer paint under my hood (in the sig pic it'* the STB, intake pipe, and mesh in the SC cover).
The ultimate solution for an intake is to make sure there'* no physical metal/metal contact from your intake pipe to your TB, then use an insulative Reducer to hold them together (silicone or something similar.....anything for a turbo application will hold up to the heat, but will it prevent heat transfer to a contact surface?), then insulate the pipe.