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I think the air is likely to be disturbed enough without the VGs.
You're car's surface is not a nearly perfectly smooth object like a solid golfball without indents. IMO I doubt they'll work and they would have to add frontal area. . .so its a small frontal add and an unlikey cd boost. . .
If you're doing it for the look I can't say anything lol. Go for it ^_^.
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