I have installed a Becker 6-Disc changer and ran the cable myself. It fits nicely in the 'first aid recess' under the cargo area. Only 'mod' I had to do was deepen the hole itself and pad it with soft foam.

Running the cable was a chore, but can easily be routed next to the existing wiring along the passenger side floor, out the front of the carpet and then into the dash to the center for the head unit. Make sure you get the 20' or 25' connection cable.

Cheers!