Wheres the best place to go through the firewall?

right here?

I am guessing you are going to be running a stereo cable or sum sort of cable. I drilled a hole to the bottom right side (as if u were looking at the front oh the car) under the brake master cylinder. The cable or whatever would come into the car around were the clutch pedal is were u cant see it.

I have an auto, so I drilled a hole right behind where the clutch pedal would be if I had one. Make sure theirs nothing on the other side of the wall and use a good drill and bit. I used a crappy one and broke about 3 bits.

This is exactly why my sig pics says what it says. It's a simple honest question

If you take the plastic wheel well covering off on the driver side, you will notice there is a large group of wires going into the firewall through a large grommet. I fit my 4 gauge audio power wire through there and viola! No drilling!