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^I can see the lock down for the 335i/135i adding to NVH as it replaces the factory rubber bushings with the solid ones and even the 4 link is a solid connection. However, the brace for the M3 is different so I am hoping it won't add to NVH. Given the long bar as the leverage for the diff, the bushings at the end of the bar where it attaches to the subframe might not need to be that hard parhaps? I guess we will see when more detail comes in.
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