Ok I spent the money and got me a half way decent sub amp for my sunfire. It is a Power Acoustik class d amp.

http://cgi.ebay.com/ebaymotors/POWER-ACOUSTIK-A3000DB-3000w-MONO-CLASS-D-CAR-AMPLIFIER_W0QQitemZ8039797193QQcategoryZ38638QQrdZ1QQcmdZViewItem

Let me know what you think. I am going for SPL what kinda sub do you guys recommend for this amp. Also I have to stay within these guide lines for the DBDRA.

· Street C Class – A maximum of 4 subwoofer amplifiers (or 8 externally bridged monoblock amplifiers) may be used. A maximum TOTAL of 8 electrical conductors may be used to connect the amplifier(s) to the woofer(s).
o One 18-inch woofer
o OR a maximum of two 15-inch woofers
o OR a maximum of four 12-inch woofers
o OR a maximum of six 10-inch woofers
o OR a maximum of eight 8-inch woofers

Those amps aren't the greatest made. If you notice, that's 3,000 watt max. Try getting something a little better, like MA Audio HardKore lineup, lanzar opti 2000, something like that.