This is a shot of the firewall location where I ran the 4g power wire. When researching running through the firewall I noticed everyone was having a lot of difficulty with it. So, I figure posting this may help someone. Instead of drilling holes, simply take the time to locate this stock opening. Through this opening the wire doesn't go straight into the engine bay, but rather it goes into a frame rail and after a few inches exits to the right into the engine bay. The hole on the engine bay side is slightly smaller, so anything larger than 4g may not clear it with room for a rubber grommet. The wire in the photo is just the wire used to fish the 4g wire.