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if yours is xdrive your springs are base and not msport.
I have acs springs on mine. My dampers also are due a refresh and im facing the same question.
go b8
go b6
or go with oem but b4
i don't think anyone has the answers and we have to find out ourselves.
Im too squeamish about b8 as acs springs only lower by 25mm and b8 are for cars lowered by <40mm AFAIK so b6 or b4 is my plan.
Or go with ACS dampers but at 1300 a set its a big outlay.
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