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I've been looking at this too, and I think the concensus is that you have to try it yourself and see what happens. I think some cars can have hotter air without retarding timing but others retard with a WAI canceling any benefits.
My Neon has a warm air intake stock pulling air from the middle of the engine bay, the scangauge tells me this tends to be 50F higher than ambient on the highway. I was thinking of ducting it so the intake pulls through the rad directly probably making the intake temp 90 or 100F over current temps. I'll have to collect some data on the ignition timing, rpm, TPS, and current temps and then try the switch to hotter air.
Ian
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