[JDBeck23]

FAF, I doubt the amp would run a sub at all. But you could use the inputs that come from the factory stereo, splice off and use them as an input to an aftermarket amp. With the battery in the trunk, you're pretty much good to go. Once GM finally comes out with the sub kit, HOPEFULLY we can buy the harness that comes with it separately and wire our own sub into the car. Without the harness from GM we'd need the pinouts for the factory amp in the trunk. But even at that, it'll be WAY easier than any other car I've ever messed with, everything is already in the trunk!