The reason the caprice mirror nets a loss when removed is the mirror reduces the laminar flow across all those window edges and gaps behind it. I used to own one and I got the mirror broken in a parking lot, I immediately noticed the wind noise and the difference is where the sides got dirty. If you fabricated small gasket areo parts over each glas and window frame transition it might make a difference ?
YOu can see this on most cars if you take some grease like teh red wheel bearing grease and place small bb sized globs over teh area you want ot see the wind flow on and do a quick freeway run on a reasonably hot day, the grease will get streaked down the car according to the wind currents.
Looks aero is not always aero.
Dave
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