If your GT3 nose has a chin spoiler it might be enough to unbalance the aero on the car. Most likely though your struts are toast at 80K. Time to look at M030 or PSS9 suspension.
My car was unusually squirrelly in braking zones with no other symptoms a while back. Bad front motor mount. Once I changed it the car was rock solid again.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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