To that last point, it is generally considered 'free' downforce in the racing world to use aerodynamic aids on the front of the car (so long as frontal area is not actually increased and turbulence is not increased). In other words, without changing the frontal area, you are merely altering the airflow over the various surfaces without increasing frontal pressure. So an airdam can technically increase frontal area and drag if it is too low, whereas a splitter generally does not.
collegekid01 
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