I got the sub box from here
http://subbox.net/store/product.php?...&cat=10&page=1
then i made the disc changer housing my self.
everything fits well but i lose the ability to drop seats down to the flat position. i did however make it possible to remove all the items if i need to do that. i made quick connects for the wires.
as for adding the amp i used a line level output adapter turning the rear speaker lines into rca outputs keeping all of the capability of the stock bose system. there is now a unit made by
http://peripheralelectronics.com/pro...&strSearch=AMP
this is a pretty good unit