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I bought my car CPO with new PS4 and noticed this wiggle then. To me it feels like bushing play. I had this on my E90 M3 and changed to stiffer subframe and diff bushings and the play pretty much disappeared. It’s the weight moving to the opposite side under hard cornering and then springing back over a bit before the suspension seems to settle. I think the F80 M3 used solid subframe bushings. It looks like the F90 has rubber and I have yet to read of anyone changing to stiffer or solid. In the meantime I am hopeful the Dinan rear toe kit helps.
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