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Yeah, thats my main concern too. Air isn't a great heat transfer fluid. What it does have going for it is its cheap, can handle high temps, and moving it is cheap and easy with a fan. Other than that, it can't carry much heat, and it needs large ducts to move small amounts of heat (vs liquid).
I'd like to run a test just to see how fast the manifold heats up on the car in normal driving. The only data I have says that in 5 minutes of idling, the manifold on my Paseo got up to 580F. I'd like to take an EGT gauge I have kicking around and throw it on the surface of the manifold and put some insulation over the top, then go for a quick spin to see what happens in the first few minutes of driving. If I can get 200F+ air in the first few minutes I think we'll be in business.
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