pioneer champ v. mofo

In my 09 G37 sedan I have the Audiobahn ABB121J (dual port box, single 12', 400W RMS) powered by a class D Elf Audio Amp (I think it's the 800x1@2Ohms) with a capacitor. I would like to keep the Audiobahn box because I love the look and clean sound I get with dual ports. I would also like to...