+1 on engine or xmission mounts. Also, rear trailing arm connects to the body near the seat. That will clunk as well with a worn bushing. With only 27k mi. in 21 years I'd look for failed suspension rubber.
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2000 Boxster S
2010 Volvo XC60
2011 GMC Denali HD 6.6L (sold)
2008 Cayenne S (sold)
1989 Targa (sold)
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