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My case was slightly different. I have a 2011 E90 335d without the sports suspension. I was unhappy with the OEM dampers. I replaced them early on with the Bilstein B6, but they would not work with the sports springs. I think it is maybe the B4, can't remember. The B6 were a great improvement no doubt, but now I am shortly going whole hog and replacing everything underneath almost, so my B6 with about 5K miles will be going on the auction block. In summary, I have been happy the the Bilstein B6. Even took them to the HPDE at Summit Point in September and they performed quite nicely.
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2021 X3 M40i: M Sport Differential, Adaptive M Suspension.
Previous BMWs: 1971 BMW 2002, 1973 BMW R75/5, and 2011 BMW 335d
Previous Other Vehicles: '67 Cougar, '70 911e, '86 Jetta Diesel, '05 and '12 Foresters, et al.
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