Apparently some aftermarket mirrors with mystery aerodynamics added for your pleasure.
Put my Batman mirrors on today!
https://bmwi.bimmerpost.com/forums/s....php?t=1810470
Stock mirror image below.
2014 BMW i3 First Drive - Cars, Photos, Test Drives, and Reviews | Canadian Auto Review
Perhaps the "Batman" mirrors deflect airflow into the cabin when the windows are open? Kind of like 1960's vent glass?
EDIT:
Lower in the post:
https://bmwi.bimmerpost.com/forums/s....php?t=1810470
Quote:
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To answer your question they do get rid of the buffeting. Had the car up to 70 mph today and only one window down and absolutely zero buffeting
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