All I know is a couple weeks ago my neighbor with an older porsche was behind me in the twisties when I was in the gt and I know he was trying to stay with me but once we got in the curves real good and I kept the shifting on point, he was no match! I felt completely comfortable too! My seats in the SS are more supportive for curves than the GTs though.
by the way you said you rode in a 02 gt, did you drive it? Maybe the driver was incompetant.:rotfl:
and if your z isn't doing a nicely on curves just find out what would make it equal to or better than an SS in handling.