Looking for a little more out of factory system. Anyone seen a box custom fit under the back seat of a 2014 crew cab? single 10" or dual 10s? what setup would you go with?

 

The 14's. Have less space under the back seat so getting a quality sub under the seat will be difficult. Look for using shallow mount subs with a decent amp and the truck should sound decent but not great

 

I have a single cab 2008, and need to keep my seat all the way back, since I'm tall. I had to find a VERY small box for this to work, and found that the Kicker comp RT 10" was the smallest truck-style box that would fit, and the output was WELL beyond what I expected. I would recommend this to anyone, I even think the 12" box would fit without issue. If I were looking for a box to fit under the back seat, I'd look into the JL-audio microsub. That is, if their stealth box does not fit these newer trucks, and if the floor is flat enough for the mircosub to fit.