Ford Focus ST Super Lock Limited Slip Differential by OS Giken Upgrade your Ford Focus ST Differential to OS Giken's high performance street and race Super Lock Limited Slip Differential. This is the perfect upgrade if you are looking to gain more traction and beat the competition. This LSD design has the capacity to house up to 28 friction plates while using a patented lock timing system. This system allows for a complete 100% lock in a progressive, smooth and quiet manner, making it suitable for both street and race applications. Manufactured using a miniaturized pressure ring along with a cut-out relief for the cone spring, means that spring degradation is decreased while enhancing durability. All components are chemically heat treated for maximum durability and constructed out of high grade steel alloy while using raw-forged gears for maximum strength. This Ford Focus ST limited slip differential works by allowing low preload while retaining 100% lock capabilities. This basically means that your Focus ST will feel like it is driving with an open differential in slow turns / street driving, but it can still transmit maximum power to the drive wheels under load. Not only will this give higher traction during race or street use it is also safer to have a LSD during all types of road / weather conditions. OS Giken Ford Focus ST Super Lock Limited Slip Differential features:100% lock capability while retaining street driveability Raw-forged gears means higher performance and durability Initial torque and lock progression can be tuned using thicker / thinner cone springs and pressure rings