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Capacitors drain their power very quickly, which is good for an audio system when you have a sharp bass hit that last for less than a second but i doubt it would do much for your car when you need the power during acceleration, unless you got a really really big cap or lots of them... in which case its probably cheaper/more effective to just get more/bigger batteries (which funny enough is also what i recommend for customers audio systems if they listen to music with more than just sharp bass hits (aka pretty much all music))
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