I have a custom fiberglass/carbon fiber enclosure in the passenger's footwell housing a 10" Alumapro sub using a .5 cubic feet. In the doors I am using the Focal Utopia series separates. For the head unit I went with the Nakamichi CD 700. Powering this from the tool kit recess is a McIntosh 4-channel amp with two channels bridged for the sub. It has internal fans for cooling which is almost mandatory if you are using this location, given the proximity to the exhaust and associated heat. I managed to sneak an Eclipse 1/3 octave parametric equalizer behind the trunk space recess on the right side. And I had a custom built Delphi XM radio mount built into the center vent/clock assembly. Yes, I know it's no Bose, but it's the best I could do...