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My 2 cents, I have the PSS on my M2 and the PS4S on my R8. The PSS have a much more firm sidewall than the PS4 so the ride feels a little stiffer but turn in / turning at speed feels more direct but traction breaks quickly at the limit. The sidewall flex in the ps4s makes breaking traction at the limit a little more forgiving. The PSS do have superior traction tho in colder temps like 40-50f. When my rears wear out I’m going with the PSS.
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