10 gig , I have like 200 gig + , I love my music !
You can get i-pod to connect to your factory through an FM modulator but its so crap that I would not bother.
Through the alpine unit (all up $599 including adaptor) - steering wheel control is extra but you can get that later.
The sound is bang on CD quality this way ;) and I am picky when it comes to it.
So $599 and your in it’s worth it.