firewall

does anyone know what the best access is through the firewall from the engine bay to cabin.
Its for my Amplifier im installing under the front seat and obviously need to wire it to the battery so i need a way in/out to the engine bay.
Are there any grommets or is drilling the best option?

Either side there are cable access grommets through into the footwells.
If i remember correctly the passenger side has an unused grommet that you could use

there is a spare grommet just under/behind the fuse box, I used it for running the cabling for my fogs.

rave says you have to take fuse box out, but I managed with a metal coat hanger, came out behind the glovebox.

just installed fogs on mine and used the one behind fuse box in engine bay.
There is a large bunch of wires passing through the grommet and just above this bunch is a rubber nipple-snip the tip off and pass your cables through, they will poke out in the left corner behind glove box