For the serious driver a limited slip differential is a must have! The stock MINI Cooper is an excellant handling car BUT hard driving can still result in wheel spin. Our unique limited slip is the only answer. While dsigned for the race track the system still provides a soft enough engagement to make it ideal for the street autocrosser! LSD is supplied complete with final drive ratio of your choice: 3.71(as stock), 4.29 or 4.54.