A 10mm spacer weighs about 10 ounces. Very small in terms of unsprung weight. Plus, all of the weight is very close to the center of rotation and thus, adds very little to slowing rotational acceleration. I would not worry about it on a street car.
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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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