Well this won't spoil (as in spoiler) lift over the car nearly as well (or at all) as the air dam.....from a straight aero principle point of view. Is this loss of spoiling enough to distrupt handling given the addition of some slight down force from the wing config...not sure you have to test it to know. I believe t here is a boxster edition with this type wing profile.....but it also has a slight air dam underneath. To me they look just a little too light to give enough down force to atone for the loss of spoiling. The Cayman R size seems to be where you need to be...been tossed around at high speed in one and it stuck unless u hit a curb
When the stock tume stone goes up I feel confident that it will kill lift and might even reduce drag in certain regimes