I have an 8" amplified Bazooka behind the driver's seat. Makes for more than enough bass, but the really cool thing is I can crank my system as high as I want and you can't hear it outside the car, unless you open a door. So no disturbing the neighbors And I can reach the boost and frequency controls located on the back of the sub while driving down the road, though once I have them set I really dont need to touch them again. I just put a piece of carpet over it and you really cant tell what it is from outside the car and it is pretty easy to unplug and move out of the way when you need the rear seat down. This is the third 245 I've done this setup in and it has worked great in each.
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'92 240 @45k & '96 960 @41k