Why not drop the factory stereo down and put the empeg on top of it?

Okay.... I went out and checked my truck to see if this is feasible. The space under the factory radio is only about half the depth of the empeg sled -- in otherwords, really only useful for putting your sunglasses in. Without taking my dash apart, I felt around behind there to see if that was just empty space or not. It's not. There's definately something back there that would prohibit dropping the factory radio down. Whatever it was I felt, it had a massive heatsink on the back, so I'm guessing that's the amp that comes with the Rockford Fosgate option. If you don't get option, that space may be free.