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That's a good point on the bumper "scoop" sticking down into the airflow. I've made it worse now with the hitch, but it's a necessary evil. I considered using the gap between the horizontal bar on the hitch and the bumper's lower lip as a diffuser slot. I'm not sure it's really big enough to do anything, but when I get to the rear section bellypan I'll have to experiment with it.
So far the ~12 degree departure angle seems to be at least as good as the previous taper. From what I've read, no one really knows the optimum departure angle for a "short tail" so I'm just copying what other major manufacturers have done.
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