The amp in question is the Quantum Audio QCA4000D amp by DB Drive. The system would come with 2 of those amps...one per sub. The amp puts out 2000rms @ 1ohm.

As far as the electrical upgrades, I do not provide those. I do sell the batteries, but do not have a good deal on high output alternators. Plus, I do not install, so wiring upgrades/extra batteries would be up to the installer and wouldn't make sense for me to provide because you want to upgrade all that with the installation to ensure it is suitable for the system.