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Better wires = better electricity. Probably wont help you power wise, but your car will start easier, lights will dim less, and just overall its a better wire. Dont go with a kit, buy the wires yourself and pay less than half
I spent 40-50cdn bucks 4guaging my whole car, but thats also because I needed like 6 more feet of the stuff because battery is in the trunk. Didnt upgrade the alternator one yet though, havent been able to get that deep in there. Grounded everything else, and the hot wire is 4guage aswell