Koni doesn't list the FSD for use with the Eibach springs - I suspect it's because of the limited travel of the lower springs.
I contacted them directly and they suggested Koni Yellow for use with the Eibach prokit springs.
Another option that will lower you about 1" is Bilstein B12 setup - uses specially valved Bilstein dampers and Eibach prokit springs, made to work together.
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2007 E93 N54
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