I run my main power wire under the car. I wire loom the 4 guage wire and use lots of electrical tape for added protection and zip tie it along the frame and then drill through the underside of the car where I need it to penetrate into the car. This way I dont have to take the entire interior out and I get better isolation. Speaker wire, RCA and other wiring is either routed through the center console or under the door kicks.
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