This all started with my cassette player busting and me thinking of replacing it. Now it has grown into, hey put in a carputer. But if I remove the unit completely and it appears to be a double DIN unit, then what do I do? It seems as though I need a HU or amp to connect the PC to for sound output so I guess I will buy a simple single DIN cassette HU as the means of doing that. Then that should leave me another space to put in one of those dww in dash non-motorized 7" Panasonic LCDs. And then I I could build or buy a pre-built unit and mount it under the passenger seat (don't know if I'd have room in the glove box)...unless I could dispense with the HU and mount a small enough unit righ in dash? But then what about this whole OPUS entity deal? Where does fit into the whole system? Could I dispense with it and go with the on-board one I seem to recall seeing? And what if I want a lot of units to power (i.e.: TV tuner, DVDRW, HDD, and the LCD) is the 150W OPUS enough or is their new forthcoming 220W one sufficient?