Check out this link - everything you wanted to know but were afraid to ask - comparing all features 2004 to 2007. I found this on some other link originally posted by RODMUS
http://autos.aol.com/cars-compare?cur_page=details&v1=USB80CDC141A0&v2=USB70 CDC141A0&v3=USB60CDC141A0&v4=USB50CDC141A0&v5=USB4 0CDC141A0