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I've fitted the Turner MS RTAB Limiter kit to my Z4MC and they do prevent the lateral movement of the OEM rubber bush in the 'x' plane, which prevents the dynamic change in rear toe angle that occurs with lateral loading, but still permits movement and rotation in the 'y' and 'z' axes.
I once fitted polyurethane RTABs on my Z3MC and whilst they did a great job, they drove me mad because they squeak like mice. I tried everything I could to try to stop the squeaking, but any lubricant failed after about 2k miles. I ended up refitting new OEM rubber bushes. Never again will I ever fit polyurethane bushes which needs to rotate or move.
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