Grab 2 of either of these subs
http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=17536
or
http://cgi.ebay.com/12-IDQ-12D4-Image-Dynamics-Dual-4-Ohm-Subwoofer-NEW_W0QQitemZ170088507867QQihZ007QQcategoryZ18803QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
then throw this amp at it...