Quote:
Originally Posted by Piotrsko
I would think that causes vortices on the back side of the cardboard.
Better or worse? I dunno.
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Super sharp separation edges and box cavities like that increase pressure on the rear. Vw xl1 and Mercedes EQXX do similar things. Many Toyotas do a partial and shorter version. And almost every modern suv does it on the sides of rear glass now
Even some semi trucks have an extension like that that opens up