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Yes, per our spec rules 255 RA1 or 255 RR,
On a 987 here in SoCal, we run 285 square (it fits 295 easily in the rear)
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We have worked with amateur and professional drivers for over 26 years. In house machinist, In house fabrication. Our cars, our parts, our engines, our transmission's run nationwide at events every weekend. We work side by side with industry names developing parts.
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