To add to the conversation... Yes MPSS and A/S tires are very dissimilar tires and would be pretty awful on the same car. She would oversteer like a drifting whore in the summer and understeer like an Arkansas hog in winter.
Matched tires (at least within type and treadwear rating) are Boxster nirvana.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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