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Lastly, I currently have a airflow channel down the bottom center of the vehicle. At the passenger compartment it measures 1 foot wide and 18" tall and it tapers wider and slightly taller at the front, only impeded by the steering rack and shift linkage.
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It's not clear to me whether this air channel has 3 or 4 sides, but I agree with aerohead that the skin friction would increase the drag.
In addition, a 12x18" duct half the length of the car will take 9 cubic feet of interior volume. Won't that require increasing the overall width of the body?