I assume you are talking about the C91's? I agree, another really good tire. C91 is the equivalent of the A6. C71 is the equivalent of the R6. Both good tires. C91 isn't quite as fast as the A6, but may last longer in the AutoX.
One Caveat for the track stuff, I run A6's until the cord. We always make the joke that they are the fastest right before they cord.
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