We used the front M5 bar with the included bushings/brackets and reused the stock 550 mounting hardware. The rear bar is not going to work well since the links seem too far stretched. This will likely counter any added benefit of the larger bar. But I am still trying to figure something out. Front bar will fit 535i and 550i, but not with active steering and I don't believe xDrive. We have a customer with xDrive I am still waiting to compare with, but that may be another week or so.
The Dinan "Shockware" made a huge difference and I now feel the car is well balanced.
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