Shuttering (sp?) is commonly your throw-out bearing see if its only when engaged or disengaged. That or a glazed fly.I bought my boxster @ 50,000 I still have to replace my brakes, @52k I did the 60k maintanence. @ 54k my clutch started slipping (in the strangest way I have ever incountered in a vehicle) it would slip at 5000 rpms catch at 5600 drop back to about 5100 and not slip again pulling through the rest of the revs. I didnt think it was the clutch but it was. replaced the dual stage fly and clutch at a porsche shop. (not dealer) I think all said and done it was 2400 bucs. Works great at 60k and the clutch still engages near the floor. Hope this helps!
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