Heres what the ad said for the system.
MA Audio Hk401SX: 1800W RMS .5 ohm stable 1 Channel High Current Amplifier with remote bass knob
Four Huge Chrome MA Audio HK120XC Subs: Dual 4 ohm 240 oz. double stacked magnets 600rms/1200 max per sub
Rockford Fosgate 1/0 awg Amp kit.
The system is bridged down to .5 ohm at 1800 watts rms and 3600 peak
What kind of alternator/ battery would be the minimum i would need to run this.
I currently have 90 amps; 12 volts alternator. But i dont know what kind of stock battery my mazda mx6 1996 m-edition has. Thanks for the responses 
it is the 2.5 v6 edition
first google "the big three upgrade" and perform those upgrades to the charging system wires, upgrade the battery to something like a kinetik, http://www.sonicelectronix.com/search_new.php?keyword=battery&action=search&query_id=3098400&query_code=986167&product_type=51&manufacturer_id=162 or a shuriken http://www.sonicelectronix.com/search_new.php?keyword=battery&action=search&query_id=3098400&query_code=986167&product_type=51&manufacturer_id=345
not sure what size fits your car look at that and find the approriate size, possibly upgrading the alternator to a high output, only look at doing this if you get everything installed and you have electrical problems
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