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do ground wire kits actually help? I saw a kit on another site and was wondering if theyre worth buying.

 
Rep Power: 291

they helped some with lights dimming, but the main thing is that if you have any kind of system. our stock grounds are ~5.5ga (15mm^2 metric gauge) i put 4ga on mine. if that 15mm^2 cable is designed to handle the car's load, any additional load you put on it will need bigger cables. i think it's funny when people put 4ga, 2ga or 1/0ga power cables on their amps and then leave the stock ground cables on the battery. where ever your smallest cable is, that's your power bottleneck.

 
Rep Power: 277

Buying? No.
Making? Yes.

Just pick up some 4 gauge wire, some ring terminals and replace them yourself.