I have posted on a few threads questions regarding the aftermarket install of a double din on a 2004 V8 Touareg but some of the questions are going unanswered. I have screened through a lot of these threads and have not found anything spot on to my current set up. My goal is to replace the non-nav radio with six disc changer in the back with an aftermarket navigation (looking at the alpine 920bt since it seems to match) which will include the bluetooth and ipod integration. I would consider the stock rns 520 but it seems to cost a little more than I really want to spend especially since its an 04. The most important thing to me is that I don't want to lose my steering wheel controls. Pac seems to make an interface that will work for my set up, but it will only allow volume control and nothing else. I would like to find a product that would include track and volume, and in a perfect world- this is a stretch i know, make it work with midi instrument display on the dash. From the research I have done, it seems like 04 is a difficult year because there seems to be more compatibility with the 05's than the 04's unless I am reading it wrong. Thats a possibility since I didn't think anything changed between those years. So does any one know of an interface that will allow me oem functionality with an aftermarket unit. I know I am expecting a lot with an aftermarket unit, but I would like to get as close as i can to reaching my goal. I am trying to do as much hw before hand instead of going out and buying a million different parts through trial and error. A few people have replied with 05's but I am looking for info regarding experience with the 04's. Along with an interface I will also need the wiring harness. That seems to be a little easier to find. But for those who have used them on 04's please give me the link to a wiring harness that you have used that turned out to work perfectly..(e.g. radio turning off when you pull out the key).