yeah, i think in it's stock configuration it will do slightly more power at 4 ohms (maybe 50W at most), but no matter what load you run it at, it should do around 800W or just over.
the mod only works for 2 ohm loads, and bypasses the protection circuitry (bad), but can get you a lot more power. it is not recommended by pg and obviously voids your warranty if you blow your amp in the process, but it involves powering up the amp with no load attached and then hooking up the subs, so it will output true 2 ohms power levels. this can be done with a relay or manual switch.
btw, where in MN are you?