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I agree with (both of) your comments. I am not familiar with the idea of a"phantom" body, but it makes sense if attached flow breaks cleanly. I will perhaps try the trunklid extension first, since it will be much easier to fabricate, and also I can do a before/after tuft test on the rear window to gauge whether its helping. aerohead seemed to be saying that the roof extension is the better option (is that what Mercedes tested?), and I agree if done correctly, but it will be harder to make and I would have to get someone to snap pics from the outside with tuft testing it. Side extensions would definitely add to support and make more effective.
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