Clutches are hit and miss on these cars.
My 99' had one replaced at 20k because of a smelly odor coming from the clutch non-stop. The slip from the dealership said it had a blue fungus developing on it.
My 01' S had to have it replaced at 50k.
I've seen some folks put over 100k+ though. My Dad's old 90' Jetta had 240k on the original clutch.....I dream of that on a Boxster.
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house