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It's warm air. The engine compartment is definitely warmer than ambient air temps. The stock system probably supplies cooler air to the throttle.
Also, it is not any sort of ram system. Ram means it uses the high air pressure in front of the car to ram a little extra air into the engine. At wide open throttle at 100 mph with a well designed ram air system you may see a couple of additional horsepower, but not much more than that. The biggest horsepower gain would really be from using the coolest air avialable.
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Good design is simple. Getting there isn't.
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