Where is the best place to drill through the firewall of a 1994 Plymouth Voyager?

I am running wire for a subwoofer, and is there a spot that would be the best to drill through, or is there a hole where a wire harness feeds through the firewall?

Thank you
 
it's usually easiest to drill on the passenger side so you don't have to worry about the master cylinder or anything. just pop the hood and look down as good as you can (I know it's tough on those things) but try to pick out a spot that is the easiest to get to so you can run the wire through the engine compartment and is also as far away from anything else as possible. some cars come with holes already there and they close them up with gromets. you gotta lift up the carpet by the firewall on the passenger side and look.
 
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