Well he doesn't really want to buy another amp, so i guess the Sony Xplod will power the Orion subs.

If he bought the mounting kit and harness for the aftermarket stereo, will that be enough to power the front speakers and rear deck 4" speakers? I looked at a wiring diagram, and it seems like the stock Delco amp behind the glovebox does absolutely nothing but amplify the signals. If i remove it, the four non-bass speakers will function the same right? I ask this so I can use the factory wiring for the front and rear speakers. (not including the 6x9 rear deck subs). If anyone could point anything out that seems wrong, it would be greatly appreciated.