ACS all the way! Almost feels like you haven't lowered the car. I had them on my 550 and now have them on my M5. Very compliant. I bought my M5 used that had H&R's and couldn't stand how rough they were. Switched to ACS within a week.
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2018 530e M Sport
2013 BMW M5 (retired) - 2011 F10 550i M-Sport (retired) - 2008 E93 M3 (retired) - 2007 E93 335i (retired) - 2006 E60 550i (retired) - 2004 E60 545i (retired)
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