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The bell shape (which I'm not seeing; the plates look parallel to me, considering that the rear body tapers inward after the wheels on a C4), along with the upward slope under the body, forms a divergent duct with the ground--which will decelerate airflow, not accelerate it....
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I guess I confuse easily. There is some advantage to a divergent duct isn't there? Trading velocity for pressure going into the wake?
I wish I had taken more pictures. The shape isn't obvious from that angle. It curved from close inside the wheel to the outer face.
This divergent bell was tested in CFD by another member of this forum. I may have time to find that later.