Could also have FE5/JE5spare wheel compartment cover has a lost of RPO codes on the back of it.
If the list contains FE1 then you have the soft ride suspension or AKA base suspension (most CTSs have this suspension)
If the list contains FE2 then the CTS has Ride & Handling suspension
IF the list contains FE3 then the CTS has the Sport suspension
so you still have the fe5? How much for all four?bobstoy said:My 2007 CTS SPORT had Performance Tuned Suspension The code was FE5. It rode very stiff and i took it off. For sale if anyone interested. Under your spare tire cover in your trunk you will find a list of all your factory option codes