I think it is going to get harder and harder for aftermarket to make kits to install different decks in the car. The systems are such a main part of the car, it would be hard to just remove it. There are many settings for the car that you access on the touch screen. The reasons I would always upgrade the stereo is to get more options, like Bluetooth, USB, and MP3 support. This has all of that. The stereo does sound really good from the factory. I personally would like to see a sub in the back for some more low end. I do think maybe replacing the factory speakers would help a little. I do a lot with sound for my job and I will say, it sounds good.