I NEED HELP WITH MY CAR SYSTEM!?

OK I HAVE A 12" SONY DUAL SUBS IN A PORTED ENCLOSURE AND A 4000 WATT-2000W RMS AMP ALSO WITH A 5 FARAD CAPACITOR..CAN ANYONE TELL ME WHAT KIND OF BATTERY I WILL NEED TO RUN ALL THIS BECAUSE I DONT WANT TO PUT A LOAD ON MY ACTUAL BATTERY SO IM GONNA BUT ANOTHER ONE IN THE TRUNK...IF YOU COULD HELP THANKS!