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Know it's off-topic some...
FWIW and as funny as it might sound, I've tried 18's & 17's for autocross, but actually found the car is way faster running the 16's off my 951 S.
Probably so but then I would have to get rid of the big reds which I would have a hard time doing for DE.
Less unsprung weight is a big advantage in AX not so much in DE. The 4 or 5 pounds saved per corner can really help.