E9X M3 Diffsonline Custom Performance Differential

Increase the torque and traction delivered to the ground for faster acceleration and reduced lap times!

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$1,449.00 – $7,149.00

A great upgrade for drivers looking for added acceleration and grip for their E9X M3*.

The E9X M3 Diffsonline Custom Performance Differential allows you to change the gearing in your car for one of the most effective performance improvements you can make for the money. For example, swapping from a stock 3.15 ratio to our 3.46 ratio will give your car 10% more torque delivered to the rear wheels!

All of our differentials are limited-slip units, meaning that both wheels put power to the ground effectively - no more wheel spin from the tire with no grip. We will exchange your current differential for a unit built exactly to your specifications, and we have every ring and pinion ratio available, including extra-short Motorsport ratios.

We have five different types of limited slip units available to suit your particular needs**:

  • M Variable - The torque-sensitive, variable M differential identifies exactly when traction is needed. Even when wheel grip varies enormously, such as on bends taken at high speed, roadholding remains excellent as the locking power between the left and right rear wheels can be raised to 100%.
  • 2 Clutch - Based off the factory limited-slip carrier, this unit is great for street use and is easy on the wallet.
  • 3 Clutch - This 3 clutch unit is designed to further increase the locking abilities of the differential for more aggressive traction and grip. Great for street cars seeing numerous track days per year.
  • 3 Clutch with Custom-Engaging Ramp Angles - Our best-selling carrier type! The carrier incorporates custom ramp angles built into the carrier for an engagement that is more substantial and track oriented. This unit offers excellent turn-in and the ability to lay down some serious power earlier during track-out. This unit has proved to greatly reduce track times and, as a result, has created some very happy customers!
  • Quaife - Unlike a conventional plate-style limited-slip differential, the Quaife Helical LSD differential relies on gears rather than clutch plates for its operation. The Quaife helical LSD never locks harshly with a set pre-load of wheel slip across the driven axle. Rather, the Quaife Helical LSD automatically biases the torque away from the spinning wheel across the axle to a constantly varying degree, never locking completely.

  • REM Ring & Pinion polishing is available for lowering operating temps and reducing driveline loses by reducing friction. Additional charges apply

    $1,500 core charge is not included in price and will be added during processing. Core charge will be refunded upon receipt of your rebuild-able core***. Core MUST be received within two weeks of delivery of replacement unit.

    **Selecting the best differential type for your application can be a difficult task considering the amount of ratios and limited slip carriers. Please feel free to contact your BimmerWorld sales representative to discuss the best differential for your application.

    ***The ability to rebuild the returned differential will be decided by the differential builder.

    REM is a registered trademark of REM Chemicals Inc. registered in the U.S. Patent and Trademark Office.

    BMW Fitments:

    3 Series
    E90 / E91 / E92 / E93 (06-13) > M3
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