Possible the PO put solid mounts in? Engine and/or transmission.
These are one of the more difficult things to describe in words so we are going to most likely throw out a bunch of things like my suggestion of checking for misfires/roughness.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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