Yes, you do need the Y cable. You can get an aftermarket one from Amazon for $22. Look for neXplug iPod adapter for BMW. It's what I'm using with my 2010 335i
BTW the 12G is the internal hard drive in the idrive. You can copy music to it using the USB plug behind the glovebox door
Last edited by gpburdell; 10-04-2012 at 06:24 PM.