Hello! Ok, upgrading electrical system which includes running a new length of 1/0 ga. from the bat to the hatch. I have a 4 ga. already running through a drilled/grommet hole on the passenger side firewall. If you have an 1/0 installed, where in the heck did you run it? I could use my current hole if enlarged...but I have no clue what to use to drill that large of a hole! If you can help, I would GREATLY appreciate it! Thanks!