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I'm running MPS4S right now on double-duty. My on-track pressure is at 32psi in the front and 31psi in the rear on stock suspension and factory alignment. I find that they have solid grip but tend to scrub out in the corners more than I would expect, I think adding negative camber in the front would help correct for some of this but I haven't modified my suspension yet.
On the street I run 35psi (factory pressure listed in the door card), and it works fine. I will say that with 4 track days on these tires that they are already giving up some grip on the street. My braking zones have extended, but there's still some tread life left. They still operate fine in the rain though.
For my next set of tires I'm going to some 200tw (probably Yokohama AD08Rs), but I have to say I've been VERY impressed with the performance and longevity of the Michelin PS4S.
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