i am thinking of replacing the stock bose sub from my cts with a aftermarket sub and i need to know what i need to do this...here is a pic of what i want.
http://i56.photobucket.com/albums/g161/rblimas/trunk.jpg

depends on how into it you want to go, i personally took the whole bose system out of my dts, headunit, speakers, and amps, but its a little more tricky on the cts since the raido is a little more propriatary.