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Rear window fairing (roof extension)
Many of the automakers today employ a fairing that protrudes from the rear of a car's trunk or a van's top. I assume this helps aero. I have also seen where people put vortex generators on the roof of their car in front of the rear window to help aero.
So, why hasn't anyone tried putting a fairing over their rear window in place of the vortex generators? I guess I need to understand why the fairing works on the trunk. Can anyone clear this up for me?
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