I would rather get one 10" sub in a small sealed box, like .5 to 1 cubic feet. It would be 10 times better than just replacing the stock sub with something else. Freeair is freeair, it won't sound good.
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Comptech Icebox, Headers, Exhaust, Lowering Springs and Sway Bars. Mugen front grille. Inspire tailamps. MOMO Sport 18 X 7.5 +42 offset. Axxis Metal Master front/rear pad. 2 Polk/MOMO 10" subs, Orion Xtreme 500.4 amplifier and Alpine CD changer.