[aerohead]

Originally Posted by California98Civic

I love that spoiler. I also suspect that the roof spoiler the OP is describing might not be so much to let air escape as it is for "tuning" the flow in some way. For example, Subaru apparently spent a lot of time and money tuning the position of those silly looking vortex generators you see on the STi from a fee years ago. The goal, I read, was to direct flow to the substantial wing on the rear decklid.

Ford's patent is available.There's no reason to speculate on it's premise,you can read it directly from the inventors.