I was wanting to replace my girlfriends radio in her 04 so she can get a aux port. The last time I replace a head unit was on my gti about 6 years ago. After looking around it seems its more than just a simple plug and play. Before I go ahead and get a unit I wanted to ask for someone that has done it before to give me a list of other things I will need. It might seem silly but I dont want to mess it up (I had a friend last year replace his and it messed up steering controls and had to have the shop fix it.) Thanks.