I have an Alpine 8" Type S in a band pass box...  It takes up more room than a 12" and really booms sometimes but sometimes is completely missing the note.  I don't really like the bandpass box.

This is what I am thinking about doing.  Install one 12" Adire Shiva ($125 direct) and a reasonable sub amp (200-400watts).  I think the Shiva will perform just fine installed directly in the cabinet under the rear bench/bed, firing forward.  Make a protective mesh grill for the back so things don't hit the speaker and a regular grill for the front.  Now, some people won't want to cut a huge hole in their bench but who is ever going to take that out once they hear it go thump?  The cost is very low and I can simultaneously recover my storage space and get more bass.

The PO muyst have had his cousin's, roommate's, sister's boyfriend put the existing stereo in.  I think they may inhaled a bit much paint fumes during that install.  There are bare wires, an incorrectly installed second battery and duck tape all over.  As soon as some money is available, I have to rework the whole thing. At least it doesn't sound too bad.

Bottom line is:  get a really great stereo!  Go a little beyond what you think will be adequate.   It makes the ride so incredible!  I am either cranking my favorite music or just listening to the wind go by...

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