At 80K miles, I'd replace all four. Since you only plan to track occasionally, the PSS9's are overkill; the stock Bilstein replacements will be comfortable on the street and fine for track days.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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