[Christ]

Ah.. it was different than I was picturing in my head.

What I'm thinking right now is that complexity of mounting/angling might negate any actual gains... I might be wrong, and it would take a fluid dynamics test to prove one way or the other, but I'm sure I could mount it if it were something I was doing.

Top, bottom, and sides... so basically you want to build an inside-out venturi around the rear end of the car?

Although, I think the lower spoiler might interfere more than help... I'm pretty sure the angle is much too high, and will cause more drag than what it negates by re-joining flow.