According to realoem.com, the part numbers are different. The picture look alike for both bars (on non ARS cars) so my guess is the spec for the 550i bar might be slightly different. Even so, I think all non ARS F10 cars sway and roll too much and a set of M5 bars (front and especially the REAR) would help greatly.
Maybe Joe at PTech will come up with something for the rear M5 bar soon. Perhaps some aftermarket adjustable sway bar links would help the M5 bar line up?
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