My son (17) just bought a subwoofer with amp and head unit for "his" 2003 Honda Civic - spent $150 total for system from someone else's wheels. I told him I'd help him install the system. Can you give me installation advice? Especially how to (i) mount the subwoofer in the trunk - it's in a box 12 x 22 x 15 high - and (ii) run wires through from trunk to dash? I have a harness and head unit install kit. Thanks VERY much for your help. Mike