Maybe just tires or alignment issues. My car is 11 yrs old with 82k miles and feels just as calm and stable at 120mph as it does at 40. Surprising really. Visually inspect the front suspension for damage or loose bushings and then have someone who knows these cars test drive it.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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