I got a 06 scion xb 6 months ago, and i got the ipod connectivity upgrade and I was just curious if this upgraded my headunit, because I want to hook up a sub and amp and was wondering if this H.U. had RCA inputs/outputs, because I really don't want to use a line level converter because I hear the qaulity is not that great.

 

No the factory headunit does not have RCA outputs, so your suck with either using an LOC or some people are selling harness that have RCA ends on them, here is a link to what they look like.
http://fs-aao.com/scion_plug.jpg