i have a 2004 tt with the tape player and 6disc cd player in the side. i would like to change the head unit for one with either a cd player in it or a dvd screen. my questions are.. will a dvd screen fit and be able to flip out without hitting the TT cover can i get a head unit of any type that will keep control of the changer and most importantly i have the BOSE system and i want to keep it, so are there any that will work with all of that or do i have to keep my standard head unit ????