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With our stock components removed, we installed the 4ga power cable through the grommet on the passenger side of the engine compartment. This grommet also houses the main wiring harness, so use caution when making your pilot hole in the grommet for the new cable. We routed the power cable down in front of the A-pillar and then down beneath the passenger-side carpet along the rocker panel. Our Mustang is equipped with a ProCharger supercharger that relocates the battery to the passenger side.