extended cab colorado
0 gauge wiring
made this port out of stainless steel in my sheet metal shop, it's 24 gauge, it doesn't flex at all, i hem'd the bottom edges, you can stand on it, it doesn't move, it's exactly 4.98 inches deep, 8 inches by 8 inches.
i can make more of these ports, if anyone wants one.
this setup bangs hard. very smooth response. fairly impressed.
pics in 2 minutes.