08/09 ST&C Ltd Subwoofer Location/Model
 

I'm trying to find the location and model number of the subwoofer that comes with the factory system on the T&C Limited. I'm hoping to do an aftermarket install in my van, I didn't get the high end stereo and would like to have a nice clean install with the extra bass. I'm guessing it's in one of the sidepanels/pockets at the very back of the van?
Assuming it's one of the infinity low-pro models, does it have a custom mounting bracket?

Any info would be appreciated.