My base Deville currently has the original factory suspension. I have no issues or complaints as the car rides better than any other car I have ever driven. With that stated I would like to install stiffer springs and shocks/struts to help stabilize the car at high speeds. I plan on frequently reaching speeds over 100 MPH and that is when every little bump or dip in the road seems to send the car on a never ending sway back and forth motion. I understand the DTS model came with a stiffer suspension for improved handling. I am interested in something similar. I obviously have no desire to convert to DTS suspension. That would cost a fortune and really is not necessary. Im not looking for anything special. Aftermarket is fine by me. I know about the front and rear strut/shock conversions but I have no idea what the ride is like. I would assume they would be soft or "stockish". I have a set of 2005 DTS 18" wheels and tires for it too so that will help with the tire sidewall roll.