On a 528i xdrive, ACS lowers it only by 3/4" at most. It is a bit more on the 550. You can check out my build thread for the 528i (the last few pics).
It does improve ride and handling greatly.
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2015 F82 /// M4 DCT - BBS FI-R | Macht Schnell EVC | Eisenmann Performance | RKP GTS Lip | RKP Diffuser | IND Cosmetic Package | CF Seats Cover
2012 F10 528i xDrive - BC Forged HB05S | Meisterschaft GTC | 3D Front Lip | Vorsteiner Diffuser | MP Mirror Covers and Spoiler | ACS Springs
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