Power wire through firewall?

[DaRockwilder]

Hey all!

Ive got a sub and an amp I'd like to put in the trunk of my Alero, so I'm wondering where a good spot would be to run a 4 gauge power wire through the firewall? I see there's a grommet at the top of the firewall on the drivers side, but where does it go? Is it easy to get a power wire though? It looks like it would be tough to get to the other side of it.

If you're wondering why I'm using 4 gauge, I'm going to a distribution block in the trunk, and then down to smaller wire, so that I already have the 4 gauge there if I decide to add more amps in the future.

Thanks for anything!