I install at a car audio shop and i have a 3 4door. If you are wondering how to get the sound to play through the factory system there is a piece called a FM Modulator. you should be able to find this at any local car audio shop. This piece takes the RCA output of the dvd player and plays it through a FM station usually 88.7, 89.1. The modulator only needs power and ground to work. They should have a male and female antenna pigtailed out, unplug the antenna from the stock radio and insert it into the female end and plug the male end into the radio. If you need to know how to remove the factory radio i will tell you. The trim piece running along the center of the dash comes off left to right. There are just little clips that hold it in and there is a hook on the right side that slides out. After that panel is removed there are two screws at the top of stock radio, remove those and the whole radio comes out separate from the a/c controls.
