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The Spec Boxster tire is the Toyo RR. Despite being technically street legal, Toyo and their dealers have a policy against selling them to anyone who plans to use them on public roads. I tried, they wouldn't.
I also drive my Spec Boxster to the track for DE days, and I went with the Toyo RA1. It's good, but not as good as the RR (which I had on for a couple of track days). The RA1 used to be the spec tire. I'm told by guys who raced them back then, that they just get better and better as they wear down, the best right before they cord. The RRs on the other hand have an optimum number of heat cycles, and then they trail off, long before they cord.
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