I put a brain and an amp under the passenger seat and another large sub amp under the driver's seat. Toss the foam, watch for wires when attaching on the pass side, and you may need to trip or remove the plate on the bottom of the seats to allow the seat to move forward all the way. Or redo your dash and put in an AVIC-D1 that has all the brains inside. There are one or two fold outs that do not require the separate box but can't remember the brand.