MMR Performance | Billet differential inserts | BMW

At PERON Automotive, we know that drivetrain precision plays a crucial role in handling performance—especially in rear-wheel-drive BMWs. That’s why we recommend the MMR Performance Differential Bush Insert Kit for F-Series BMWs (F2x & F3x).

The factory differential mounts allow for excess movement under load, which can compromise suspension geometry and driveline stability—especially during hard acceleration or cornering. MMR’s precisely engineered insert kit reduces this movement, helping to maintain correct alignment and deliver sharper, more predictable handling.

Designed for practicality, the kit is quick to install (under an hour), requires no permanent modification, and is fully reversible, making it ideal for performance builds and fast road cars alike.

Key Features:

• Designed for BMW F2x & F3x chassis

• Reduces movement in factory diff mounts

• Improves drivetrain control and suspension consistency

• Helps maintain geometry under load and cornering

• Simple, reversible installation – no subframe removal required

Perfect for enthusiasts looking to tighten up their rear end feel without sacrificing comfort or daily usability.