Hello, I'm new to the boards and I recently purchased a 2009 CTS 4 (AWD) and have noticed a handful of board members have opted to use Eibachs RWD 31838.140 spring kit to lower the AWD platform, with what seems to be success. My question is if that works will any other CTS spring kit work being in theory the same part just diff manufacture or drop height?? And makes me wonder if the springs will fit. Why won't the shocks/struts fit as well making maybe possible to install a (RWD) coil system to an awd vehicle.... Ultimately Im just attempting to lower the vehicle with what seems to be limited if any options for this car, which is def a first for me since I've owned and slightly modified my cars.. Thanks in advance guys!!