ya i was gonna say that i pulled the carpet back and took out the insulation under the seat a little to make room for my amp...

also, i had to bend the piece of metal on the back of the seat that keeps stuff from sliding under there, my seat wouldnt go forward at all before i bent this....

secondly, if your looking for volume control for the front/rear speakers that should be adjusted from your amp ONCE, and should not be changed once adjusted so that shouldnt be too much of an issue...

secondly, your GPS should only be heard from the front left, and with the split it should be heard from the whole left side, which is a little bit of a bummer but you should still hear your music on the right side....

just my 2 cents...

nice integrated set up though...those are some good components all around...