Gearlab is one of the UK’s premier BMW differential specialists, and after months of development, have made their own E46 M3 Billet Differential Cover available. The cover boasts some great upgrades over the OE stock differential cover and other flat back aftermarket covers available.

Check out some of the upgrades:

• Machined from billet T6 aluminium
• Improved oil flow
• Improved design to improve cooling efficiency and heat dispersion
• Muffler silencer breather vent to avoid debris/contaminants entering the differential
• Increased oil capacity
• Oil breather baffling plate
• Pre-machined blind hole for oil temperature sensor
• Comes with original OE bush mounts for fast road vehicles, or solid mounts for track-focussed vehicles
• Includes 2-pin temperature sensor for monitoring from -40°C up to 150°C, ideal for race applications or fast road users
• Increased strength over OE cover
• 10mm solid mounting support (to avoid the common issue of cracking with the OE cover)
• Neodymium magnetic plug
• Laser-etched Gearlab logo
• Oil cooler compatibility (AN12)
• Fitting kit included
• Anodised in silver

These improvements all help increase the performance, oil life and fuel economy of your differential. No more cracked mounting brackets which are common on the OE stock cover. The cover is specifically designed to minimise aeration within the oil, this helps to reduce heat, viscosity and degradation of the oil. Fluid flow pathways allow oil to direct to key areas, imperative to the longevity of any differential. Gearlab has engineered the optimum distance between the crown wheel and the oil raceway for the most efficient paddles of oil to be directed were its needed most.

The most comprehensive E46 M3 Differential Cover available.