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Yeah I have a box behind all three rows. Had a local shop in my area build it for $60. It fits my 2 12" JL W3. It was one of the my favorite mods Ive done its just soooooo convenient.
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Feel free to ask questions
you could fit the new JL W5s back there. they are really thin thats what my buddy did in his denali and i'm eventually gonna do in my tahoe.
I had the W5 in my 08 and it fit perfectly behind the third row. Problem for me was that I love ported/vented enclosures and W5's a recommended by JL to be sealed. I returned it and threw in a 12W7. I lost 1 seat, but the sound is incredible.
I can post a pic if anyone's interested.

I'd like to see the W7 box...![]()
Like Titanium says, "W7's or BUST"
W7's are the best of the best IMO and I do not miss my 3rd row seat at all having this beast of a sub.