going from stock w/o CD to stock w/CD? i would assume its the same but couldnt tell you, id recommend upgrading to an aftermarket headunit, the sound quality will be a lot better and you will have more options and gadgets. with going with an aftermarket headunit a dash kit and wiring harness will be needed... also the more i think about it there may be a size difference between the stock w/CD and stock w/o CD so you may need a dash kit anyways i would research that if i were you and see if theres a difference... although i think they are all double din units from the factory..