Can't comment on the Sumitomo. Never drove on them. However, if you want a great tire that sticks and is good in the rain, get the NItto's.
Nitto NT555 Extreme ZR 225/40R18 $124 each, rear 265/35R18 $181 each
Great price for a great tire. I never heard of them, but when I purchased my Boxster the former owner had these put on. I liked them so much I put them on my Jaguar XJR and could not be happier.
Eric
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