How old is you car? How many miles? Another common problem is worn /slipping motor mounts that cause knocking over rough surfaces and hard cornering. Get her up on a lift and start poking around. There is a good motor mount repair DIY over on Renntech.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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