One other random thought or info.
1.0" of water is = to 0.0360911906567 PSI.
A camaro hood is roughly 4' x 4'
Remove 6" for cowl pressure and you have about 2016 square inches.
An average of 0.75 inches of water pressure differential over that surface.
You are looking at about 55 lbs of lift on just the hood. No wonder my hood latch failed with two track days with speeds of 150+ and 130+
If you are able to route a lot more air out the top of the hood rather than under the car then I'm guessing that can result in a downforce change of a lot more than 55 lbs. But that probably requires a lot larger hood vent opening a la one lap camaro.
