Might be time to clarify something. The coatings you'd put on headers and exhaust components are designed to hold the heat IN.
You want to insulate your intake from the heat getting in. There'* a big difference. Even putting header wrap on an intake pipe might hurt you in the long run, as the pipe WILL heat up over time and hold that heat.
I have mine wrapped in reflective thermal insulation, and plan to re-wrap it sometime this weekend if I get the other work done in time.
Perhaps the best product out there is this: