Are any of these functional in any way? I see the ones that direct air to the radiator that serves a purpose obviously. But as far as a "spoiler" goes, are they just for looks, or do they actually create any down force at highway speed? I'm surprised my el camino feels relatively planted on the highway (I have a theory that the low pressure air pocket in the bed may act as an upside down wing to a certain extent, but I'm not an engineer by any means) but my old Regal felt like it wanted to lift off at about 80 and really could have used some down force.