They're not aerodynamic at all, but neither are they in the stock position. They are completely flat facing the wind, essentially truck mirrors. The only real difference is its shrinking how much they stick out into the wind. There is actually a noticeable change in wind noise in the car with the mirrors in. I'd love to have them gone, but backing up a 4000lb car is hairy when you can't see the edges.
Also, I have one of the oversized convex mirrors, it works fine. At night its no trouble because the headlights can't get focused on your eyes. In fact, thats all I really need. The other mirror is there just for back up.
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