I recommend you do this:
Subthump enclosure with an MTX 12". Sounds amazing. 
http://subthump.com/Ford-Sub-Boxes/Focus
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2007 Pitch Black ZX3 SE with FocusSport CAI, custom glasspack exhaust, and 12" MTX sub in Subthump stealth enclosure with 450W MTX RTP202 amp.
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