So...Right now I'm trying to hook up my subwoofer and amps, and I've gotten my cables and all wires hooked up except for my power wires (4 gauge) because I can't find a good way to run it to the battery. My setup is 2 subs, two amplifiers, and 4 gauge power to each amp. I know it probably been simpler to run 0 gauge from the battery to the back and then split it to two 4 gauges, but I got the 4 gauge from a friend for free so I'd like to use it and not have to spend any money. The battery is on the passenger side, and I've taken off the panels and stuff and I just can't find any place to run the wire through to the battery. I've also looked in the fuseholder but theirs also no openings in that and I can't find any unoccupied firewalls. Do I need to drill a hole or am I just not looking in the right spots?

Sorry about the long read. Thank you for any help you can give me.

drill a hole and use a grommet so as to prevent wire chaffing

Dont drill any holes, instead pull the wire through the little slot inbetween the hood and door and run it through the door jamb

If u really want it to look like hack job this would make perfect sence

Its better than risking safety problems by drilling through the FIREwall

Or you can just cut a small slit in one of the grommets thats already in the firewall. Thats what I did for my amp and cb.

on firewall by wiring harness/brake booster are see if there a rubber grommet which goe thru the fire wall run wire thru there cut gromment to allow acess