there is a rubber grommet that passes through the firewall on the drivers side just to the left of the brake and power steering resivoirs, its very easy to get to and comes out above the pedals, i think the speedometer cable and one other comes through right next to it as well, i ran a 4ga power wire through there no problem, just pop the grommet out, drill it a little smaller than your wire and force the wire through, then run your wire through and pop the grommet back in (make sure its facing the correct direction when you put it on your wire) let me know if you need pics, where you mount your amp depends on the size, i one amp under each seat, but they are small in size (2-1/2" mounting depth on drivers side, smaller on pass.) there are pics in my gallery