Are you on H&R sport or Super Sport? Does the ride suffer? Also, about how long did it take to swap out the springs?
Gone but not forgotten: 2008 BMW135i Vert
Gone but not forgotten: 2011 MB C63 AMG
Added: 335i, BSM/BLK, M-sport, Sp. Auto, Prem, Tech, HK, 19", lots of Plastidip, H&R Sport, 245/255 Ventus V12