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A good portion of what causes the air to get hot is not the heat from the engine, it is the heat from the air flowing through the tube. The air heats up the intake tube and then that furthers the heating process. Shielding the heat from the engine is one thing, but the intake will still be heated by the air travelling through it. Putting a heat shield on the intake can cause you to not feel the heat when you touch the intake because it's insulated, but that doesn't mean it's not hot on the inside. You also could theoretically make it worse because the air travelling around the intake will not cool it since it's insulated.....of course the cooling effect would only happen when you're going fast enough to get cooler outside air circulating around the engine.
You'd possibly benefit more from coating the inside of the tube than the outside, or just coat them both for maximum effect....or just buy an Iceman. This was the entire idea behind Iceman, an intake tube that did not retain heat. The air would still heat up but the intake wouldn't retain the heat.
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