I would simply recommend the stock (or similar OEM style) bushings for typical street use. Any harder bushing will likely have a negative trade off (anywhere from minor to major) in NVH (noise, vibration, harshness).
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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