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My experience on the FR-S is that the PSS are better cold than the Primacy. Once heated up on the track, the Primacy grip pretty well, far better than they do when cold on the street. I've not taken the PSS to the track on the FR-S, but on my 550i, the PSS got greasy when heated up. There was also some driver here, can't remember who, who gathered data that said how, at the limit on the track, the properly warmed PSS and Primacy were equal in grip.
That is why, for the street, I use PSS. For the track, I use Primacy. Lightly used Primacy are cheap. If I wanted to go faster at the track, I'd go with something like the RS3.
Primacy are really fun track tires. When warmed up, they clearly communicate their limits.
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