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Ok, so I have done some work, the vibration is less pronounced but still present.
Had the left tension arm replaced (ball joint was considered faulty).
New wheel bushing on the left (old one was noisy).
All wheels balanced.
Full alignment done.
I have also cleaned the hubs and spacers and torqued them to spec. Spacers are Eibach 15mm with centering hub. The wheels sit flush on them, there is no play. OEM BMW wheels so no need for special centering rings.
The car is drivable and it definitely is better now, but still the vibration shouldn't be there. It appears at around 120 km/h.
I now I could try it without spacers, but with everything done correctly they shouldn't introduce vibration AFAIK. Spacers tend to escalate any existing problem, so I think it should be investigated as is.
I am going to have the shock absorbers checked, maybe one of them is faulty, I don't know. If anyone has an idea hit me up!
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