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typically spoiler uprights attach to the bottom of the spoiler. a spoiler is an upside down wing and anything attached to that surface reduces the downforce generated. in a swan-neck wing, the uprights curve around (like a ... swan neck) and attach to the top of the wing instead. porsche is using one on the new gt4 clubsport. the swan neck approach also lets you mount the wing further back to increase the leverage of the downforce. given that the force is not directly down on the uprights anymore, there is now a torque action on the baseplates, so tuners have started mounting them to the chassis out the back of the car instead. not so good on a race car, however, where folks are always banging into you.
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