It's nice to read some good discussion on the internet about aero. I've worked as a design engineer for 3 different race teams, mostly mechanical design, but also a lot of surfacing for CFD and wind tunnel testing. I've worked with some very good aerodynamicists, and the only sure thing about air flow, is that it has a mind of its own
Question for plucas...out of curiosity, are you using actual Scion CAD data (via SEMA tech transfer) or did you scan a car?
Good reading discussion, keep it up!!