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capacitors in general store energy with the intent of smoothing out spikes ...
when you have a high power audio system with large subs, often the subs will draw large amounts of power during peak times (like when you get a real big boom) ... this can draw too much power from your alternator causing your head lights to dim or other strange things ...
putting a cap in there will store up some energy so when your subs need that short burst it takes it from the cap instead of the alternator.
again I really think you'll be ok on your stock alternator with 2 subs. i know guys running a lot more in cars your size.
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