hey guys this is a great and informative site!. I have a 2003 mercury Grand marquis stock everything when it comes to electrical, system wise i have 2 15" kicker cvr's in a sealed box powered by a 1400.1d autotek amp, and truth be told i want to upgrade my subs. I was looking at the FI selection but cant figure out wich one best suits me i mostly listen to hip-hop and was wondering wich Fi sub would be louder then the cvr's i was thinking maybe a 1 15" in a ported box or maybe 1 12"? Thanks for your help n time oh BTW i have about $350 to spend thanks