Drilling a hole into the firewall?

if i were you, i wouldn't stick any aftermarket wiring (especially if you're installing yourself) in a firewall hole that has factory wiring going through it. i had a bad experience once installing foglights--i stuck the wiring through a hole that had a factory harness it in, and when the wires accidently melted, they also melted the factory wiring they were next to. find an empty hole or drill a new one--just my advice...

yeah that big hole with the gromet is great I got so many wires runing through that thing it ain't even funny