Yup those are 87 numbers. Good chsnce though it was underated. It was still pulling off mid to high 13's though. In 87 they added a torque bar that went from the frame to the differential to keep the differential from twisting underload. Therefore transfereing even more of the power to the ground instead of drivetrain losses.
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Garrett
98 Silvermist GTP(sold)
96 Ebony Satin nitrous powered SHO
(sold)