Okay, first thing: the difference between a spoiler and a wing:
A wing generates downforce, by the principle of aerodynamic lift applied to an inverted aerofoil. The tradeoff of this downforce is increased drag.
A spoiler spoils laminar flow over the surface of a vehicle, reducing overall drag by keeping airflow from "pooling" as it were in areas that cause undue drag. (For example, when air flows into the low-pressure zone behind a car, causing additional force pulling on the rear of the vehicle; a spoiler prevents or reduces this)
Whereas a wing's effects are only noticed at high air speeds, a spoiler's effects are noticeable at speeds commonly seen on public highways.
Anyway, the aerodynamic device in question:
I did some searching around and I can't find anything on this. Given the fitment, I can only assume it's an application-specific aftermarket body component. Yes, I know it's likely just for show, but even if it is, I'm okay with that. Mostly I just want to know more about it.
So does anybody know anything about it?