I have this set up from my GTI available.
It's less than half a year old .. didn't expect to let it go so soon. it's a great package for cars with very little trunk space.
Pioneer TSSW251 10" shallow subwoofer $149 new
enclosed in
Pioneer UD-SW100D 10" shallow mount downward firing box $80 new
I bought the package for over $200 new
dimensions are as follows:
Pioneer UD-SW100D Single down-firing sealed enclosure for 10" shallow sub at Crutchfield.com
I'm looking for $120 obo.