MMX Billet subframe inserts | BMW F2x & F3x

By filling the small voids in the four factory mounts as well as limiting vertical movement, our inserts eliminate the associated slop to ensure that you experience a more refined, connected driving experience; especially when driving at the limit. The billet aluminium parts will not wear over time and offer a lasting performance improvement.

The BMW F2x and F3x chassis use rubber rear subframe mounts that deflect under load, causing the rear end to feel vague and loose, as well as leading to less-than-optimal suspension geometry and increased understeer. These precision-machined billet aluminium inserts are designed to fill voids in the factory rear subframe mounts, and limit subframe movement without sacrificing ride quality or introducing any perceivable additional noise, vibration, or harshness into the cabin. The result is a more refined, connected driving experience, as well as improved effectiveness of aftermarket rear sway bar upgrades and suspension components.
Billet CNC machined 6061-T6 aluminium.

Fills void in OE subframe rubber bushings.

No additional NVH transfer inside vehicle.

Easy install with subframe remaining in-situ.

Reduces rear subframe movement during launches and acceleration.

Helps maintain correct suspension geometry under dynamic loading.
These inserts were tested extensively by us in-house and independent BMW enthusiasts before release on multiple F2x and F3x vehicles. Our diff inserts fit diesel, petrol, manual and auto variants.