You gotta either make a new hole on the passenger side and run it that way, or make sure you got enough cable and round it around to the driver side which is there the hole is in the firewall. As long as you run it nice and hide the cable good it won't matter, that's how I have mine. Just make sure you have enough cable. I'm talking about the 5 gen. I don't know if the different gens have the harness come in through the firewall on the the passenger side.