Quote:
"The air whisking by would bowl it over, right? "....???
Anytime you "make" the air change direction, it creates drag.
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I interpreted that as 'the ambient air will cause the exhausted air to hug the side of the car'. In any case wouldn't the heat exchanger at the bend change things? It looks to me like a straight shot to the face of the heat exchanger, an abrupt change through it and then a fairly straight exhaust that almost angles forward to where the air sloughs off into the ambient flow.
kach22i -- You are good at finding and/or cataloging this stuff. Anything on the BMW Air Curtain™. I believe it's a tall narrow slot in the wheelwell lip, where the Porsche has a recessed channel that's more external. I also notice diffusers that collect air toward the front brakes without an internal duct.
Wolf_Tm -- You might want to review Autospeed on the Magnahelic gauge:
Optimising Top-Mount Intercoolers