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If I understand your pictures correctly, it appears as if you have two styles of diffuser/spoiler thingees. Seen from above, one splits closer to the center of the car, while the other splits at the centerpoint of the tire.
Did I get that right ?
If so, my guess would be that drag reduction would depend on the suspension pieces around the tire. 'B' would tend to send more air to the sides of the car, while 'A' would split it equally .
If the underside of the car is smooth and the suspension pieces don't hang down much, it still might be beneficial to send the air around the sides of the car.
I'll let the experts answer. What do you say guys ?
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