so im lookin to add a little more boom boom to my stock system. my last car had a pretty nasty system in it, but now that i have a baby, i really dont have the use or cargo space to add a huge stereo. im wondering if anyone has installed something small like a low profile powered sub or a bazooka under the rear seat. i know its not going to shake my mirrors but i need a little somethin goin on back there

 

I'd look into the spare tire sub. That may be enough boom to keep you happy and save you're cargo room.

 

Well my friend and I built a sub box underneath the rear seats. it looks amazing. It has (2) 8's in it, but it didn't hit as hard as we would have thought, so he is redoing the front face to just do (1) 8" sub. The box looks nice though and fits perfectly

 

^that.
Tactile transducer attached underneath the seat would also be a good addition if you want to feel some bass, it will also produce a little low end sound as well. I have 2 on each of my seats, one underneatn and 1 inside the back, underneath the outer fabric.