If you were to install an efficient wing or dam in the front, you'd end up with handling that makes the car want to pivot on its nose more and more as speed increases. So then you're forced to install a wing or dam in the rear to create equal force on the rear of the car to re-balance the handling. The other possible goal you can have is to simply divert enough air away from going under the nose of the car to zero out lift. This can be accomplished with something less visibly obtrusive.
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