MMR Billet Differential Inserts for BMW 1 Series 2 Series 3 Series 4 Series 2011-2019 - MMR12-6001 - MMR Billet differential inserts for BMW Our 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. 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. Features Billet CNC machined 6061-T6 aluminium. Fills void in OE differential rubber bushings. No additional NVH transfer inside vehicle. Easy install with subframe and diff remaining institute. Reduces rear diff movement during launches and acceleration. Helps maintain correct suspension geometry under dynamic loading. Additional Information Worried about noise? NVH is a measurement of how much noise, vibration, and harshness gets transmitted into a vehicle’s cabin. Based on feedback, MMR inserts transfer little to none NVH into the cabin. NVH is subjective, so some users may find NVH to be increased or decreased from our rating. If you are experiencing higher than quoted NVH with this product, please evaluate the installation to ensure the components are installed correctly. Fitting Information 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. Vehicle Fitment Series 1-Series 2-Series 3-Series 4-Series Chassis code F20 F21 F22 F23 F30 F31 F32 F34 Model year 2011 - 2019 Model variant All model variants Engine code All engine codes