do caps work?

[stones 10+ year member]

This is relevant and deserves consideration.

.https://m.youtube.com/watch?v=T9mlvbF0flM

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[Thor230]

The capacitor is going to act like a small sponge so if you have a very hard Bass drop or some other type of short bursts of full power that capacitor will unload its juice instantly yes somebody can make a joke about that if they want. Anyways it's only goal is to keep unnecessary voltage fluctuation from happening but it does not store power for a very long period of time especially not if you run your system with the car off if it's between that or battery I would go with the extra battery because even though it does not discharge as fast as a capacitor it's a better sponge overall and you can play it with the car off

 

[gckless 5,000+ posts]

shouldn't have issues unless your vehicle is a unibody which would require a direct ground run front to back.

You could just drag a bare wire behind your car. If it's touching the ground, that's a direct ground run.