22/10/2026
BMW G8x M2, M3 and M4 owners... Let’s firm things up at the back.
The factory rubber diff bushes are tuned for comfort, and under the torque of the S58 they flex, letting the diff move under load. Our new Rear Diff OEM Bush Aluminium Insert Kit fills the voids in those bushes with precision machined 6061-T6 billet aluminium inserts, holding the diff firmly while the rubber stays in place to do its job. Running our Dual Differential Mount? Add the single insert to support the second rear bush and complete the setup.
The result is a firmer, more connected rear end through launches and hard acceleration, with no extra NVH in the cabin, on both RWD and xDrive.
Fits straight into the factory bushes. Fully reversible.
https://bit.ly/4yEVquv
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Available from all MMX dealers globally. Find your nearest MMX dealer https://mm-x.com/pages/store-locator