I have a 2006 S4 with the stock Bose stereo system with in-dash 6 disc changer and cassette. I want to upgrade the system, at least the head unit.

I want to iPod capability, bluetooth, HD radio and maybe satelite radio. When I visit, several audio/electronics websites that have option to input your vehicle and they tell you stereo and speaker sizes, each one says "corporate panel" and then show me options for single DIN units only.

The stock stereo is obviously the size of double DIN unit. I have seen pictures on this website with S4's and A4's with aftermarket double DIN units installed in them. Am I missing something??

Also any input would be much appreciated on what type of unit (brand/model) to install. As I said I am interested in a unit that has Navigation, full iPod control, bluetooth connectivity (telephony), HD radio and satelite radio. I would also want to connect it to the stock Bose speaker system in the car. Also, want to still be able to use the steering wheel controls and still have the info display on the center informational display between the speedometer and tach. Not asking for much am I??? (hahaha)

Thanks again.