BMW 215K 215LW 135i 225i 140i 240i 550i LSD Wavetrac Helical (30.309.155WK)

A unique helical LSD for late model BMWs. A supurb option for your M135i MT, M235i MT, E39 540i or E9x 335i. This is a quiet, predictable and long-lasting LSD unit. Backed by a strong warranty which is transferrable should you sell the vehicle. The Wavetrac is the only helical design which will not spin the inside wheel should it lift off the road/track. The Wavetrac differs from a traditional helical, and has friction plates fitted which are replaceable and can be changed to modify the lockup characteristics.

• Innovative: Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike any other torque biasing diff design.
• Superior Materials: 9310 steel gears run in case-hardened billet or forged steel bodies. ARP® fasteners used throughout.
• Maintenance Free: As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds.
• Customizable: If desired, you can alter the diff’s behavior to suit your needs using optional components.
• Limited LIFETIME Warranty: All Wavetrac® differentials include a transferable, Limited Lifetime Warranty.