a pair of RE Audio sl10d4 subwoofers dual 4 ohms wired to 2ohms. box is custom built spec sized and yes of course fits neatly under the rear deck.
Each sub was $275 and i built the box to optimal specs sealed for tighter cleaner bass. they are rated at 350rms each which is loud enough but have been known to take 500+ rms each i kept these at around 350rms. im located in ewa and can hook em up if you like to hear them. call/text 8013763687 used for about 2 months decided i wanna go back to a re sx10 so no need these. $350obo. heres a pic

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hmmm.....these would work perfect for my project....may be interested if and when I can get the funds....