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I think you will find this of interest. In reading many posts about cold vs. warm air intake, I looked at the intake on one of my cars, a 1989 Mitsubishi Galant. I was intrigued to find that it has a large, long sealed tube that leads from the radiator to the air filter can. The other tube, which is the actual intake, draws air from an enclosed box just behind the grille at the fender, away from the radiator. (See attachment of diagram of the entire system. It's #3, simply called "branch tube".) Apparently this setup is meant to blend cold and warm air, as needed. The sensor unit is very large and is mounted literally inside the air filter itself.
Since the car has always gotten (relatively) good mileage and has very good acceleration as well, I'm not about to start modifying it. I think the design of this system might provide clues as to what is most effective in the ongoing intake & air temp debate.
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