a clothes hanger wire is my favorite tool for running amp wire, i ran new wire in this kids 00' grand prix and made a slit through the rubber groumet for the power wire so there wasnt a huge hole in the fire wall
You would think these car manufacturers would think of making an accesories hole in the firewall for all the electronic gizmos these days. ARE YOU LISTENING GM
the problem is they don't want you adding any electronic gizmo, they want you to buy their top of the line junk, never aftermarket