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From the same chapter:
"R. Buchheim, et al, in a survey of fifteen production cars, found no correlation between aerodynamic drag and interior wind noise levels. One explanation for this lack of correlation is that the aerodynamic drag depends largely on the exterior airflow over the rear of the car where the wake separates from the vehicle. Conversely, interior wind noise depends largely on the details of the exterior airflow around the A-pillar and windshield."
So, start there. Adding an air dam would probably lower the car's drag, but it won't make it quieter--in fact, I'd bet it will increase wind noise as more air is routed over the body instead of under it.
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