Isn't the McLaren one controlled by the drivers knee? Then it is controlled. What i was saying was, if the air is let to run freely through the duct it will stall the wing in the corners which would make it useless, so i was asking what controls the airflow.
How is it about looking cool? It's nothing to do with it, smoking isn't cool at all. For most people that start it's not even a question of looking cool, it's just to experiment. You've just shown you actually know jack shit.