Suggestion:
Ditch all 4 "grand touring A/S tires" and put Hankook RS-3 in 225/45/17 F, 255/40/17 R sizes. This will transform your car which is currently riding on minivan tires
This might be the best $600 you ever spent on a car.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.