A new generation compond developed after the 83 compound. Higher bite and higher average torque.
Racers claim three times the disc life.
Pad life of the 93 compound is slightly better than 83. 93 comes on quicker and has a flatter torque curve - a plus in some applications. Without finesse you can over slow the car in a hurry. Check out 90 or 83 if you are over-slowing the car. . It also has a higher wear rate under super severe service.