I find it easier to use the grommet on the passenger side to run the power wire through. The grommet on the driver side is down below the brake booster and I recently just ran my boost gauge vacuum line through there and it was not a good time. Once through your firewall, just continue the line under your carpet and door moldings and through your backseat to the trunk. ( just pull out the bottom portion of your backseat) Do the same for the RCA's and turn on lead on the opposite side. And youre ready to go.