VTT F9X M5/M8 Rear Differential Front Bushing Insert Kit

Want to tighten up the differential on your F9X M5 or M8 and eliminate unwanted differential movement during hard launches, aggressive driving, or cornering? VTT has you covered with our Billet Differential Insert Kit.

Precision CNC-machined from 6061-T6 aluminum and anodized black for a durable, corrosion-resistant finish, these inserts are designed to fill the voids in the factory differential bushings, significantly reducing differential movement while maintaining excellent street manners and OEM-like ride quality.

The result is improved drivetrain stability, more consistent launches, reduced wheel hop, better power transfer to the pavement, and a more connected feel during acceleration and cornering. This is especially beneficial on tuned and high-horsepower vehicles where differential movement becomes more pronounced under load.

Installation is straightforward and can be completed with basic hand tools. Simply remove the differential mounting bolts one at a time, lower the differential slightly, install the billet inserts, and replace the factory hardware with the supplied upgraded bolts and washers.

Kit Includes

• 2 Front Billet Differential Inserts
• 2 Hardened 49mm Steel Washers
• 2 M12x1.5 x 110mm Mounting Bolts

Features & Benefits

• CNC-machined from 6061-T6 aluminum
• Black anodized finish for long-term durability
• Reduces differential movement under load
• Improves launch consistency and drivetrain response
• Helps minimize wheel hop
• Improves rear-end stability during acceleration and cornering
• Better power transfer to the ground
• Direct bolt-in installation

NVH Notice

As with any drivetrain-mounting upgrade, a slight increase in noise, vibration, and harshness (NVH) may be noticed. This is normal and results from reducing movement in the factory rubber bushings and decreasing some of their sound-dampening characteristics.

Fitment Guide

BMW

• F90 M5
• F90 M5 Competition
• F91 M8 Convertible
• F92 M8 Coupe
• F93 M8 Gran Coupe
• F91/F92/F93 M8 Competition