Subwoofer

[phenom01515]

ok i currently have a 12 inch sub, an amp and basic wiring that i would like to integrate into my stock bose system of my 03 h2. i need to know what else i need. i was told i need some sort of harness to bypass the stock amp and go to the aftermarket amp? where do i get this harness and where do i splice it in? any help on this would be great.