mp3 player
I just removed my factory single CD player from my 04. 5 2500 and installed my JVC mp3 player. If you want mp3, you can either change out the stereo head unit for an after market or buy one of the after market CD changers that support mp3, Sony & JVC both offer them that have RF modulators that feed the audio into the radio receiver on an FM channel that you can set. The sound may not be as good as direct audio, but I have seen good reports and not so good reports. If you want to change out the radio for an after market, there are kits to mount the after market unit and wiring connectors to mate with the existing harness so you are not cutting wires in the truck, it is pretty easy and getting the old unit out and the new unit in is easy.