Say I were to get subs. . .

Hey, not exactly sure if your question was answered yet, but ill give it a go. I ran my power cable on the right side since i didn't see a good place in my firewall hole on either side of the car. So i picked the side closest to the battery, the passenger side. If you look down where someones feet would go if they were sitting down there, you can pull up the carpet (there should be a few clips to take out) and you should be able to get to the bare metal of your firewall. I had to drill a hole in mine (took f'in forever) big enough for my powercable to fit through. I sealed it with some epoxy stuff i found in my garage so the cable wouldn't get pinched by the metal surroundings of the firewall.

I've ran my power down the driver's side on 3 accords now... it was just easier since the grommet directly behind the intake manifold pops through above the gas pedal.

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Also check what finch said as well... as i was not aware of this. GL!