For anyone that has wired up some aftermarket subs, where and how did you send the power wire through the firewall to the battery? Plugs? Drill?

 

Right next to the gas peddle there should be a rubber plug that goes straight into the engine compartment. I just drilled a small hole in the middle of that, and pushed the power wire right in. Used a couple of zip ties to keep it away from hot things and ran it right under the carpet on the inside.
Pretty easy.

Hope this helpled.

 

I ran mine right over the fuse box on the pass side. There is also a rubber plug in that location. I like that one because it is on the same side as the battery. Keeps your power wire shorter.