A bit apples to oranges comparison:
I have the PS4S on my Z and the ECS on my Miata and from what I can tell the PS4S are a stickier tire.
The PS4S are really an all-around improvement on the PSS, which would be the closest to the ESC in my opinion.
They are still a very noticeable step down from 200 TW tires, but I've rarely felt that the tires are holding me back on grip.
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