I put the 997 GT3 brake ducts in the intended orientation (opposite of Glynn). I don't have any objective data proving that they work but I have done two track days with them on, and have Laguna Seca next weekend which is a tough track on brakes. The front edge is a little close to the subframe but that little slot in the leading edge of the deflector kind of fit nicely where the subframe edge is. If you look under the nose of the car you can see that scoops hanging down a tad, so it has to do something. I was really happy with how they turned out from a fit standpoint. I'll snap some better pictures of them when I get home later.
Interested in the pictures.