The Becker unit fits fine in the 'first aid' recess in the cargo area under the floor panel. It could also be mounted in the area behind the passenger footwell with the factory amp as there is plenty of room. You just need to pad it so it doesn't flop around.

NOTE: The Becker CD changer will NOT play the NAV discs. I keep only audio discs in the changer and keep the NAV disc for the western half of the USA in the head unit at all times.

The only reason I have a CD changer at all is so I can trick the unit into using the CD changer audio inputs (which I have my iPod cable spliced into).