- High-quality components for a long-term durability

Although the FX725 features minimal rotational mass

For over 15 years

They are perfect for forced induction setups

are designed to meet the extreme demands of high-performance BMW S55 engines

OS Giken SuperLock LSD, BMW E39 M5 4275 - High-quality components for aOS Giken SuperLock LSD for BMW E39 M5 Track Ready Limited Slip Differential with Street Comfort Upgrade the rear differential of your BMW E39 M5 with the OS Giken SuperLock LSDdesigned for smooth, progressive engagement and uncompromising traction. This performance differential features OS Gikens exclusive pressure ring technology and a spline through side gear construction that accommodates up to twice as many friction plates as conventional LSDs.