Dinan 3.91 Limited Slip Differential

The shorter 3.91 gearing takes advantage of torque multiplication for a substantial increase in torque delivered to the road. The improved acceleration comes with only a minor increase in engine speeds at cruise and no effective reduction in top speed potential. The 3.91 ratio was selected in order to enable the car to attain a speed of 60 mph without introducing a second to third gear shift which would otherwise slow down 0-60 mph times. Changing the ratio to 3.91 from the stock 3.62 will give an 8% gain in torque.

The Dinan® 3.91 Limited Slip Differential delivers what is perhaps the greatest ''bang for the buck'' in terms of improved and more immediate acceleration from the M3.

Category: Z4