The amount of heat encountered underhood, especially where the intake tube is located, just isn't that critical. Sure, you could shave a few degrees of the intake charge, but a ceramic coating will stabilize at ambient which is what you're trying to avoid. You have to remember how ceramic coatings block heat, as they're priamrily designed for exhaust applications. For the short run of our intake and the lack of direct or radiant heat sources you just won't see any benefit from a ceramic coating. Remember, you're trying to fight ambient temperatures. You'd need some magic wrap to actively cool the intake.