I'm not going to be rude and laugh, but my difficulty is with a fan that draws air from the engine area out rather than into it. I mean, have you felt the draw the engine fan produces? If the engine is at full song at even 4000 rpm, youll have a fan trying to push against all that air coming in. It almost seems like it hasn't been thought out completely. No offense.
If there is downforce at speed, it seems logical to my aerodynamicaly simple mind that there is some higher pressure there. Isn't force measured in some sort of measurement of pressure? I know my car has downforce in back cause my front end is too light (I don't have a spoiler yet).
1977 911s. it's cool