Even if you had something similar that could be used for intake vents, it wouldn't really work. Sure you could suck in air, but they are on the side of the car and would get no ram air effect at all so its really pointless.
The "real ones" are heat extractors. They are in a low pressure area and would be conterproductive to an intake setup. Real ones may has some purpose if you could use them to vent underhood heat. Not really nessesary in these cars.
Those are stick on's. Kind of like fake tattoo's for cars!
And they look stupid (IMO). Well, unless you want your car to look like a Buick!