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What I've found is that sitting at a light, the IATs go through the roof with an open intake in the engine bay. This causes timing to be retarded. When you start moving, IAT usually comes down. If you immediately go WOT with larger IATs, you'll get less power until the IATs come down and the ECU stops applying the correction.
I have logged IAT in my car with the stock intake and anything over 20 mph, I see ambient as the IAT. I haven't seen data with my own car that corresponds to AFE's testing, especially not an improvement, since the car is already drawing in ambient temp air. I wave the brown flag on the AFE numbers, since obviously they are not going to be cooler than ambient. There simply isn't anywhere the stock box can get non ambient temp air once you are moving even slightly.
The AFE on my e46 M3 drew in hotter air than ambient until 40 mph. :/
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