re:  Are these really functional as air scoops or are they merely
cosmetic?

I've always questioned whether any horsepower gained by air scoop ram
effect could overcome the extra aerodynamic drag created by the
scoop.  Clearly, for a scoop to be effective, the system must be
closed from the scoop to the air mass meter, and that will be
difficult.  The scoops are merely cosmetic and it's a good thing
they're open at the rear.  I'd be willing to bet the official SA parts
manuals call them "trim" and not "scoops"  and they'll be on a body
page and not a fuel system page.