That's a hefty load on any car. First off, you'll need to have atleast 2g wires for everything. Make sure your alternator is directly connected to your + battery terminal with the 2g wire and reground the alternator with the same wire. I would definatly suggest running a second battery in the trunk with a seperate ground, but connected + to + with the first battery under the hood.
The MOST important thing with this much wattage is fusing! Make sure you have a fuse with in 18" of the battery under the hood and another fuse before the amp. If you neglect the fuses, one small short can catch stuff on fire and everything you have done will be wasted.
