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ITBs are probably the coolest naturally-aspirated mod out there. But, yeah, ditto on what folks said -- VERY expensive and tuning is essential, but the sound is outrageous.
Here's a picture of one of the cars from Fall Colors 04, below. Awesome!
well judging from the picture, it would seem that it would better feed the air to the ITBs rather than it just sucking air from whatever is under the hood. although it would seem that there isnt as strong of a suction of air through the intake, but meerly just feeding/scooping. someone correct me if im wrong?