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Hi Edbso,
I think that is a good idea. Even the Prius has the vortex at the top of the A-pillar. I can see the swirling/stagnation of the rain on the driver's window there. Some concept next generation Prius have shown side dams there. But, that is allot of extra drag possibly, due to the air going sideways, and not up over the roof axially. So, putting in a turbulator is probably just the thing. It will chop up the big vortices into little ones, which have less cross-section (boundary layer height). At least that is my guestimate of why its quieter.
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