I checked with Bavarian Autosport and ACS does not appear to have springs approved for the 2014 535i, however, Eibach does. I've heard good things about Eibach in fact I believe that Eibach manufactures springs for ACS to their specs. I may have to give them a go. I was also told by Eibach that there should be no issue doing just the springs without doing anything with the shocks
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