I actually ran some 4 gauge through the grommet on the DS last month with AleroSS. Before I was using an 8 gauge, and it would fit through the hole on the PS, but the 4 gauge was WAY too big. When you remove the mat and the plastic cover on the underside of the dash, you'll see a grommet with a bunch of wires coming out through it. I used an exacto knife to make a small cut in the grommet and sent the wire through there. Then I pulled it up beside the fuse and relay center using a coat hanger. This saved me like 3-4 feet of total wiring length.... which, at a couple of bucks a foot, was well worth the effort.
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