All E90 BMW applications with a welded ring gear are now able to be installed in house in 2-4 weeks depending on how quickly we have a break in CNC time to drill and thread mill the ring gear. The Wavetrac differential, stub shaft seals, ring gear bolts, and machine work is included in the package price. The oem BMW diff housing to start with must be supplied by the customer. 

• 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.