I think i personally ran a 2 gauge power line, and a 2 gauge ground line. It can be a pain in the ass to get a shop to install the ground line. they will give you this "we never do that shit" , just give them the "I'm a paying customer, if you want to do this for free we can do it your way" Power + ground wires on 1 side of your car, run the Shielded RCA lines (preferably ones with gold plated contacts) on the Other side of your car , this makes it so you get 0 engine noise.
If you don't use a ground wire , your cars frame gets juiced all the time. you will get shocked more often getting out of your car. you are more likely to pick up engine noise on the RCA lines (since no matter which side of the car you run them on there will be returning power to the battery going through the frame next to them) And lastly constantly sending electricity through metal is an Oxidation method. (forms rust)
There is no good reason to use the frame of the car for a ground Especially once you are playing with a system that is over 1K watts.
Think i was running 12 gauge wires to my sub IIRC
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