Stillen Roof Wing

Originally Posted by ZKindaGuy

It's position looks like it relocates the air flow deflection force more toward the CG point of the car which in essence would decrease any downward force on the wheels.

One could argue that the downward force would now be to the immediate front of the rear wheels instead of behind the rear wheels at the rear deck lid wing. But because any deflaction force with this wing is now moved more than half the distance toward the CG point of the car it would lessen the amount of downward force being generated over the wheels.

So someone please explain what is it's advantage as the physics resulting from its location seems to suggest a possible disadvantage.