There's this great web site that will tell you anything you want about that and more:
I have a bose sound system in my a6 and i hear converting to an aftermarket head unit is quite complicated. I need to know what all i need to get, all i have now is the faceplate to fit. please help. thanks
thanks for the help, i didnt think of the most used search engine in america, why would i think of using a forum?