I would really like to buy a factory sub and amp. Without buying a whole new system. I have 2010 SXT with the mid grade audio package. Uconnect and ipod already is installed. In the back there is a spot on the left rear. Right below the 3rd row seat, next to the led flashlight, where a "screen" is. I don't know what is behind it, but I believe this is where the factory sub goes. I don't want to start ripping it apart to find out if a sub is already there. I wouldn't think it would be a problem to purchase a factory sub or amp for the Parts Dept. at a Dodge dealership. If anyone has any thoughts on this please respond. Also I will replace all the factory speakers that do exsist.