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You don't need a capacitor it's a waste of money. Upgrade your stock battery to something better like a stinger or optima. You should be fine electrically. How much are you looking to spend on an amp? What is your total budget? Are you installing it yourself or do you have to pay someone?
You have dual 6 Ohms subs so you have to find an amp that has your power requirements at 1.5 or 6 Ohms. Most likely 1.5 Ohms which narrows your choices because a lot of sub amps will burn up below 2 Ohms. You could probably use a 2 Ohms stable amp but it's likely to get very hot and not be reliable not to mention burn up in a couple of months.
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