The areodynamics are much more critical than you might think. If you put a "real" scoop on your car, you have to think about what you are doing to the air flow. Where is it going to go? If you are scooping air into the body in the front of the car, you will run a little cooler I would guess, but you are no longer going to get the down-force, you will actualy be creating "lift" if you are dircting the air down.
I see no benefit to it, other than it looking cool.
Am I going back racing?...Hmmm.. Not anytime soon... But soon enough.