Thanks for the info, but I don't want to build a new car.
I am looking for specs and colors and options on others so I can look for a used one.
I have a 99 STS and am thinking of going to 2005 and up for rear wheel drive. Looking to do some performance mods which are not available for front drive cars.
If you would Google 2005 Cadillac STS you will find sites with old reviews that contain specs and other stuff. You won't get a KBB list, but actually, there has been little changed since 2005 through 2009 except some colors and the second series look. Basically the car is the same run for all the years. There is a few geezer options on the 08 (lane changing, ect) but overall, it is the same car. The six cylinder engine has been chnaged since 2005, but the other mill is the same. Good luck. Its a hell of car.