when someone wants to move from an XE basic radio to an SE-version midline 6-disk changer radio, does the aux line input come prewired from the factory, and all one then has to do is to either add the 2.5/3.5mm wire plug transition piece from Nissan or soldier a basic transition aux plug you get from Radio Shack?
Or do you actually need to get an additional harness to make this transition up 1-level of radio happen? And if so, where would you get this piece?