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Carlos -
It would appear that they follow the relative taper of the rear body work, but nothing more. To that extent, yes, they taper. I doubt, however, that it's anything close to an "ideal" angle for flow.
Frank -
A good many of those designs, the intent of the sides seems mostly to be solely to support/add rigidity to the top. It's as if they're not even concerned with side flow, but only believe that flow occurs top and bottom?!
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