there is a hole in the middle of the passengers legs on the firewall a zero gauge wire can fit through. I was thinking put the battery on the passenger side of the hatch then run the cable under all the interior panels on the par passenger side then through the firewall with a post right on the engine compt side of the firewall where the batter used to be.. why do they say to use a sealed box? o wait let me answer that for the person who will crack on me next its to avoid crankwalk right lol