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Ram air, while cannot pressurize air, does have one quality in race cars. if gives a consistant cooler air source compared to the engine bay.... high horsepower/ high performance motors always give off more heat- thus while alot of those cars you'll see ram air setups for both turbo and n/a
most lightly modified motors won't see dramatic engine temps, and infact ram air can cause issues with a/f especially if you daily drive it through the different seasons...
running a stoich ratio in the summer could possibly get you in trouble in the winter when you go lean from colder air.
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Your mis-knowledge of modern engine tuning is your weakness
On one of the pages of the SCT Pro Racer handbook talks about how tunes should NEVER need to be changed based on season/temperature changes. The tune should be robust enough that the ECU has enough room to adjust according to the data provided by the Intake Air Sensor Temperature and the Mass Air Meter. Else they'd have to tune the cars richer for the summer from the factory, to get them to run right in the winter. They don't do that, otherwise they wouldn't be able to get them to pass todays stringent emissions in the summertime! Doh!
I know, for a fact, that the PCM in the mustang can make adjustments to the MAF transfer function according to the IAT inputs, because I've watched it do it via my datalogger.
Ram air CAN pressurize the intake tract, however slightly, depending on how it's done. You won't see the extra HP on the dyno, because the car isn't moving fast enough to generate air-pressure in the airbox.
Case in point - why does the Mach 1 Mustang, which is basically a N/A 32-valve cobra motor (same as in 99->01) make more horsepower and put down a faster 1320 e/t time than a cobra with the exact same motor minus the shaker (read: ram air) box?
~Brad