800 watt RMS sub, how much wattage do I really need?

Question (not referring to this back and forth deal about power,) I have 2 Skar Audio RP4500.1 amplifiers. I have just purchased 2 Sundown Audio X-8 V.3 D4 800W RMS dual subs and about to purchased 2 more (totaling of 4) for a 2001 Acura MDX running on a 250A alternator, a dry cell secondary battery and a Gravity 800A Car Audio Battery Stiffening Power Capacitor. Would that be enough to push those 4 Sundowners?
 

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Question (not referring to this back and forth deal about power,) I have 2 Skar Audio RP4500.1 amplifiers. I have just purchased 2 Sundown Audio X-8 V.3 D4 800W RMS dual subs and about to purchased 2 more (totaling of 4) for a 2001 Acura MDX running on a 250A alternator, a dry cell secondary battery and a Gravity 800A Car Audio Battery Stiffening Power Capacitor. Would that be enough to push those 4 Sundowners?
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