MMX Performance G8X M2 / M3 / M4 Rear Differential OEM Bushing Aluminum Insert Kit - For OEM Single Rear Mount

The MMX Performance Rear Differential OEM Bushing Aluminum Insert Kit (MMR55-1618) is engineered for the BMW G87 M2, G80 M3 Sedan, G81 M3 Touring, G82 M4 Coupe, and G83 M4 Convertible, including applicable rear-wheel-drive and xDrive configurations.

The factory rubber differential bushings are designed to isolate drivetrain vibration while allowing a degree of movement under load. During hard acceleration, launches, and rapid changes in drivetrain torque, this movement can reduce the precision of the connection between the differential and chassis.

MMX addresses this with precision-machined aluminum inserts that fill the existing voids in the factory rubber bushings, limiting differential movement without requiring complete bushing replacement. The result is a more controlled differential mounting arrangement while retaining the factory rubber bushings.

CNC-machined from 6061-T6 billet aluminum, the kit includes four front inserts and one rear insert for the factory single rear differential mount configuration. The installation is fully reversible, allowing the original mounting arrangement to be restored if required.

Product Details

• Vehicle-Specific Fitment: Designed for the BMW G87 M2, G80/G81 M3, and G82/G83 M4, including applicable rear-wheel-drive and xDrive models.
• Factory Bushing Retention: Aluminum inserts fit into the existing OEM rubber differential bushings without requiring their replacement.
• Reduced Differential Movement: Fills the voids in the factory rubber bushings to limit differential movement during launches, hard acceleration, and dynamic loading.
• 6061-T6 Billet Aluminum Construction: Precision CNC-machined for accurate fitment and consistent support.
• Five-Piece Insert Kit: Includes four front inserts and one rear insert.
• Single Rear Mount Configuration: Designed for vehicles retaining the factory single rear differential mount.
• Factory NVH Isolation: Retains the OEM rubber bushings to help preserve their noise, vibration, and harshness isolation characteristics.
• Fully Reversible: Inserts can be removed to restore the factory bushing configuration.
• Established MMX Design: Developed from MMX differential bushing insert technology previously used on BMW F2X and F3X platforms.

• Free US shipping on orders over $250.
• Free pickup at our Dallas shop, usually ready within 24 hours.
• Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
• Want it installed? Book the install at thegbmotors.com.

Full details are on our shipping and returns page.