Is it possible to do this with out making a hole or something in the floor? I drive a 2001 honda civic coupe ex

 

there are many holes that already lead through the firewall..you just need to get under your dash, pull some carpit away from the firewall and you will see wires from the inside going through..just follow and see where they come out on the other side of the firewall in your engine bay, then just feed it through the same hole