Description Reviews The Quaife Differential (LSD) powers both drive wheels under all conditions, instead of just one. With an ordinary open differential, standard on most cars, a lot of precious power is wasted during wheelspin under acceleration. This happens because the open differential shifts power to the wheel with less grip (along the path of least resistance). The Quaife, however, does just the opposite. It senses which wheel has the better grip, and biases the power to that wheel. It does this smoothly and constantly, and without ever completely removing power from the other wheel. In cornering, while accelerating out of a turn, the Quaife biases power to the outside wheel, reducing inside-wheel spin. This allows the driver to begin accelerating earlier, exiting the corner at a higher speed. This can give you a 2 to 3 second better lap times! Note: This unit will fit the R56 Cooper S. We have personally installed one and it worked! Install Note: When installing an LSD, don't forget to buy a set of bearings.