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ye it is basically a large capacitor that holds a charge , and releases it when high power amps need it.
the point of them is if u like yer music very loud and when the bass is on some batterys and alternators wont cope with the sudden need of power so yer lights dimm to the music. a cap would stop this
my old 106 did it with just the headunit on full wack
as for u needing one only if you planning some major upgrades then id try it with out one first