[strictlypersonl]

From the pressure diagrams that I've seen in various automotive aerodynamic books, the lowest pressure on the hood is only a few feet back from the front edge of the intake. From there back to the base of the windshield, the pressure increases. You can see the application of that phenomenon on the GT40 and the Cobra Coupe, where the vents are put only a short distance behind the radiator. I mention this because, on the CSX shown above, the vents are likely placed in a non-optimum location. If you want to maximize the pressure effects, put the vents about mid-way (or forward) on the hood.