Do the front engine mount and see if it helps. It's a cheap part (it's a 987 part for all Boxsters now) and procedure should only be 2 hours labour. It will fix your 3100 vibration, give more immediate throttle response, and should improve shifting - if shifting still needs some work, at least you've done the mount and taken that out of the equation.
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2001 Boxster S, Seal Grey
1998 M3, Estoril Blue
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