My Son finally decided he doesn't need to go boom boom in the trunk.    
So he's selling a 12"  Kicker Sub: $120 - it's only a few months old   
http://www.bestbuy.com/site/compr-12-dual-voice-coil-2-ohm-subwoofer/7739042.p?id=1218859509037&skuId=7739042&st=12%20inch%20kicker&cp=1&lp=2   
Amp is a 800 Watt JVC amp. He has the box out in the garage I'll have him get the model number tomorrow. - $120   
Prices are OBO.    
Box - Infinity Bandpass box. Will get a pic soon. does have a 5" port for it. - $50 - or free if you buy all of the above.    
http://i283.photobucket.com/albums/kk314/buck531/infinitybox_zps3de49eb8.jpg   
I'll also throw in the wiring that goes to the aux post (I think it's a 4 gauge wire) and whatever else you might need.