MMX Billet differential inserts | BMW F2x & F3x

The MMR Performance differential bush insert kit for the F-Series BMW (F2x & F3x) is designed to limit movement in the factory diff mounts to maintain proper suspension geometry when cornering. Installation is very simple, can be performed in under an hour, and is completely reversible.

By filling the small voids in the three 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 diff 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 differential 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.