some vents might be to aid cooling. since viewing this thread i'm looking with a little more attention to these areas and only today i noticed on i think a mazda 5 mpv that the "fake" airscoop on one side as actually open and had a little radiator behind it that vented into the wheelwell at the back... i suppose this is for the airco.
but it created an interesting tension between the left "fake" scoop and the right functional one.
this is largely off topic but what i mean to say is that not every vent is an "air curtain" and might be for just styling or cooling, and i think on the subaru it's likely one of those
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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