I'm currently running Kuhmo XS tires on my Boxster and they offer great performance. My auto-x times have dropped quite a bit after switching to these from the PS2's, but they do wear out fast which is to be expected since the wear rating is 180. Probably not the ideal tire if you're looking for a longer lasting street tire. I've heard P-Zero's are pretty good, why are you wanting to switch from them to something else? If you're looking for less expensive tire that still offers decent performance and longer wear maybe check into the Kuhmo MX or Dunlop DZ101 tires.
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