Not that this is weight loss conscious, but it does show where I've kept things stock more or less for weight distribution. Now, that distribution creates another phenomenon which ThumperDart brought up, Parachuting.
Below is the example of a catch basin bumper and thus, the reason for creating lightweight air foils to attach to it to close off that basin and smooth the winds.

65' AFX Altereds did the same, but for the front of the car.