Sounds like you have a durametric. Have you checked for codes yet? I have seen sometimes that durametric doesn't always show pending codes so maybe a generic reader with torque (torque always shows me pending codes)
I would get it hooked up and check misfire on each cylinder.
next would be to check rpm & cam1, cam2 deviation at idle. Just to see where it's at.
If it sounds metal to metal I wouldn't think it's a mount since those would be rubber.
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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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