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I believe its a 8" fosgate sub that is mounted in the right or left rear panel behind the rear seat you can probably get a custom enclosure similar to that style and buy and after market amp and sub that will fit in it or you can raid some junkyard xterra's to look for the factory enclosure to put your sub in. I for myself added a 10" fosgate sub in a custom box to the factory 6disc 6speaker set-up (in a frontier though) and it sounds great! good luck
later,
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Black Knight - 2004 Crew Cab XE-V6 4x4
"...God made men the way they are because we desperately need them to be the way they are. Yes, a man is a dangerous thing, but so is a scalpel. You don't make it safe by making it dull, but instead you put it in the hands of someone who knows what he's doing." - John Eldridge
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