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Diffsonline - E9X M3 Custom Performance Differentials
E9X M3 Diffsonline Custom Performance Differentials

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Price: $1,899.99

Part Number: 0321

Carrier Type:

Gear Ratio:

Refundable Core Charge:

REM Polishing:


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

Changing your cars gearing is one of the most effective performance improvements you can make for the money. For example, swapping from a 3.15 to 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 pull - no more wheel spin. We will exchange your current differential for a unit built exactly to your specification. We have every ring and pinion ratio available including extra-short Motorsport ratios.

We have 6 different types of limited slip units available to suit your particular needs**:

  • M Variable - The torque-sensitive, variable M differential lock 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 abilities to lay down some serious power earlier during track-out. The unit has proved to greatly reduce track times and as a result, 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.
  • OS Giken - The increased number of friction discs not only dramatically improved the LSD's locking force, it enables it to lock fully and completely. An added benefit to being a fully locking mechanism is that less heat is generated, thus resulting in incredible durability and reliability.

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

$95 flat rate shipping/packaging fee.

$2000 core charge is included in price via a mandatory option. 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 Chicane Motorsport 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.

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