[jaykay]

Yes, it really looks great! I am surprised you are not hitting the tail lights on retract....How on earth did you prevent this? Looks really good. You could have even gone with "the Wing" I linked up below. How does it feel to drive at speed? Any stability changes?

Has anybody got a handle on the effect on aero with the removal of the flat blade?

From the looks of things the blade would reduce the lift created by the back upper surface of the car by outright airflow disruption while creating a fair bit of drag.
But this drag would look to be off set by preventing some "suction" airflow drag behind the car.

The Cayman wing looks to rely on down force from a wing shape than airflow disruption and of course is made to work with the Cayman rear deck.....How would this compare with the Boxster.

Any flow visers out there?