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Old 07-18-2021, 07:56 AM   #821 (permalink)
RedDevil
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Red Devil - '11 Honda Insight Elegance
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I think they create a vortex, and that helps to prevent the buffeting that would otherwise happen with the window open.
Typically air rolls over the A pillar from the bottom of the windscreen to the sides, and that would then hit the wing on the mirror and be guided upwards.

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