[steve00s]

You are right downforce is like negative or reverse lift. I guess what I was trying to say was that the amount of downforce is not positive like with an F1 car where at high speeds many pounds of downforce are generated. The aerodynamics of the Boxster is not designed to add great additional positive downforce but to compensate for the amount of lift inherant at speed. I am not an engineer so I risk getting in over my head by saying anymore.