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1/0 is plenty big but that homedepot shit is stiff as hell, good luck with it. Its also hard to find 1/0 gauge terminals inexpensively. You need an H bar to hold the battery down, drill two holes through the floor, run the J bolts through, and use locking nuts and washers at least 1" in diameter. I ran my 2 gauge inside the car and through the firewall and it took me about 17 or 18 feet. Run the ground through the trunk floor to the frame. do the same up front with the factory negative battery lead. I just bought a set of screw in posts, screwed one to the chassis in the front and used the factory battery lead end, and then use an isolator block in the front.
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