I have MS Manifolds (cast iron). I had my manifolds coated to retain the heat inside. I did that years ago (10ish) and have not noticed any cracks. I don't have empirical evidence if it helped with under hood temps. Typically, you would want the heat to be retained to help spool the turbos faster. I believe the coatings I used were by Cerakote. I even had the turbine housings coated.
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