Welcome to the forum!! I too have heard that they are under the center console and that its a 6 1/2" sub.

 

thanks for the help guys. would it be better to unhook the stock sub and put a new one in underneath my rear seator just leave it hooked up and run both subs, or is that possible? i'm kinda new to this car audio stuff.

 

You can buy a line output converter specificaly for the trucks with the bose system at www.logjamelectronics.com and then run a seperate amp and box under your rear seat. Thats what I did. Sounds the best. Box for our trucks can be purchased at www.subthump.com Great quality. Theres a thread about boxes in the audio section with some pictures of one of the members installs, check it out. You have to you a relativley shallow subwoofer though. Pioneer Premier makes a shallow mount and so does Rockford Fosgate. I went with the Fosgate Punch Stage 3 shallow mount DVC 4 ohm. You can get it at www.crutchfield.com Take note of the boxes mounting depth and get a subwoofer that will fit depth wise. Also take note of the boxes required air space, and find a woofer that works in that range. The boxes at subthump provide you with that information and most subwoofers will provide you with that under specifications.