Modifying the top mount isn't in the cards - that would put the car in a highly modified class. GT3 control arms are allowed, with rubber bushings not heim joints.
Getting more camber seems like the best compromise to meet class requirements for 2 different racing groups that each have their own classification system. Its a compromise. And it helps set limits for me to not go overboard modifying a car that my wife drives to work periodically.
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2022 PCA Zone 7 Autocross Chair
2001 Boxster 986 (base) #414
-PCA GGR: Class Champion AX12 '18, '19, '20; CC06 '21; CC05 '22; PAX 5th '19, 3rd '20, '21, & '22
-PCA Zone 7: Class Champion P14 '18, '19; P02 '20; P-03 '22; PAX Champion '20 & '21
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