Does anyone know if there is an existing opening in the firewall to run
power cables to the battery or if drilling will be required? I believe I
could drill through the space where the clutch would be in a manual shift.
I was quoted $300 by a local installer for a an install on two amps and a
head unit, so I am trying to do this myself.

 

there is an opening close to the upper driver side just remove the rubber cover and you can get the wires through there.

 

There is a hole behind the accelerator pedal. Its behind it and up to the right a bit.Its a ***** to get it through there though.