I have one to add. My Pontiac Trans am when it was new in 1986 was the most aerodynamic vehicle GM ever produced. When the Trans Am was restyled for 85 it registered a coefficient of drag of .29 down from .32 from the 1982 version. My car has been lowered 1.5" on top of that, so mine might even be lower than that. That is of course after I block off the nostrils in the aftermarket hood the last owner left me with.
Can't post pics, resolution to high.
It is interesting to note that even the stock hood rose above the wipers so as to clean up the airflow over the windshield. After the 4th gen redesign the design went backwards and the wipers and even the cowl intake was in the airflow increasing the drag over the 3rd gen design.