I am installing a little sound system for my sister in law in her 2004 Explorer XLS. She isn't wanting anything too big and she wants to spend as little as possible, so I chose a single MTX 12" sub, box, & amplifier package from Crutchfield: http://www.crutchfield.com/App/Product/Item/Main.aspx?search=mtx+package&i=700RTP4512 My question is about running the wires in these Explorers. Should just I run the wires under the carpet? I understand that I will need to have the power wire on the opposite side of the vehicle from the RCA wires to be sure there is not any noise from interference. Which side should the power wire go, driver side or passenger side? Where should I take the power wire through the firewall? Where is a good place to run the ground wire? What length wires should I buy? 16ft or 20ft? Obviously the RCA wires can be shorter than the power wire. What do you all recommend I use to keep the box from sliding around in the back? This is the head unit I am using for this install, the JVC XG500: http://www.crutchfield.com/App/Product/Item/Main.aspx?search=xg500&i=105KWGX500 I chose the JVC XG500 because it is the cheapest double din available with separate sub woofer volume control and the front auxiliary port. Thanks!!