I've never heard of using paint to insulate piping. I bet it has negligible benefit.
And I do agree that keeping heat in the DP is not anywhere near as important as holding it in pre-turbo for turbo spool. I really don't know how beneficial the coating on my DP is considering I still have the 3rd cat right after it, but it is worth it regardless just to keep the underhood temps low and keep it from radiating heat to the TMIC.
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