I have a 2001 Yukon xl non Bose and the factory rear sub is blown. I mean really blown it sounds terrible. I hear it is an 8 inch 2 ohm but I was curious how hard it would be to throw in a new cheap one in place. Would I need to run a amp? I have stock head unit too. I am probably going to throw in some sony xplod speakers in the front and middle seats like I did with my silverado which help a lot. Would this be worth it or is the factory sub box and head unit amp too bad to keep with a new sub. I am not looking for a window and mirror shaking sound, just some good lower end bass. Thanks