I am selling the Nissan factory ipod integration kit. Very easy to hook up basically you unplug your sirius/xm tuner in your trunk and this plugs into the same cable or you purchase an optional cable so you can have both xm and ipod functionality. You will need the factory wiring for xm/sirius for this to connect. This also charges the ipod and maybe charges iPhone.
This site has more info comparing the adapters: