Turner Motorsport G8XM Dual Mount Differential Cover

The Turner Motorsport Dual-Mount Differential Cover is engineered to unlock the full performance potential of your G8X M3 or M4 by leveraging an unused secondary bushing location built into the factory rear subframe. This smart, track-proven design delivers more secure differential mounting, helping reduce unwanted movement, extend bushing life, and dramatically improve driveline responsiveness.

But the benefits go far beyond added rigidity. Precision-machined from 6061-T6 billet aluminum, this cover features an aggressive fin profile to enhance heat dissipation, ensuring cooler differential temperatures even under extreme load. The internal geometry is designed with performance in mind—fluid is strategically channeled across the ring gear thanks to an embossed profile that mirrors the gear’s path, keeping lubrication consistent where it matters most.

Whether you're street driving or pushing hard at the track, this cover offers the perfect balance of durability, thermal control, and functionality.

Key Benefits:

• Dual-Mount Design: Utilizes factory subframe’s unused secondary bushing location for added support, reducing drivetrain deflection, extending bushing life, and minimizing wheel hop
• 6061-T6 Billet Aluminum: Strong, lightweight construction with excellent durability and precision fit
• Aggressive Cooling Fins: Maximizes heat dissipation to reduce fluid temps under aggressive driving conditions
• Optimized Internal Geometry: Channels fluid to the ring gear for consistent lubrication
• Fluid Capacity: 1.1L capacity comparable to OEM for easy fill and maintenance
• Cooler Compatibility: Includes -6 AN ports for an optional external differential cooler to increase fluid volume and extend service life
• Sensor Options: Compatible with the factory fluid temp sensor or aftermarket 1/4” NPT sensors via an included adapter

From spirited canyon runs to endurance track days, the Turner Motorsport Dual-Mount Differential Cover is your solution for a cooler, stronger, and more responsive rear end.