the proper way to run a power wire for a civic is threw the firewall, there is a grommet to the lower right of the battery if ur looking under the hood, its plenty big for any awg wire you are putting in, then run it down the passenger side to the back under the carpet. i personally run my remote leads with it just so you can have the drivers side free for rca's and speaker wire if you are doing a four channel. running them on separate sides eliminates the chance of engine noise heard threw the rca's and or speaker wire. in the back when you are hooking up the amp, if they cross paths of each other to also eliminate the chance of engine wine its good to cross them at a 90 degree angle.