Tire compounds harden with age. What you have now is a newer tire in the front with rubber as soft as it gets from the factory and tire on the rear which has probably hardened over the years. Not very conducive to balanced handling, besides the differences in how the tires are designed.
I understand everybody's financial situation is different, but mixing tires, in my experience, isn't going to get you where you want to go with the Boxster.
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2013 Boxster S
2006 Boxster--sold
1999 Boxster--sold
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