I've had a set of PS4S, AD08Rs, and now RS4s. Of the three, so far my favorite has been the AD08Rs but I haven't put the RS4s on track yet. The PS4S is a fantastic street tire, but it just can't hold up to consistent track abuse at all. I had serious problems with chunking and weird shoulder wear tracking on the PS4S, but I will admit it did much better than I expected. If you're doing 6 track days a year you'll be bankrupting yourself buying Michelins. The AD08Rs were the cheapest decent 200tw when I got them, and the RS4s were cheaper this go around. For street/track hybrid role, 200tw summer tires seem to be where it's at, at least here in Texas.
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