Custom Subwoofer box made after ALOT of though, ideas and more ideas on what to do in regards to bass. every vehicle I own including the wifes all have stereo systems simply because I love music, for road trips with the family we take her rogue so it's a must for me.
This is what I ended up with. after originally wanting a ported truck style wedge box as tall and wide as the rear seat (but would be annoying to have to slide it down and place it flat facing up when I need to fold seats down for cargo)
Box is made to spec for 2-8" Massive Audio Sumo 84's Its a bit over 2cu ft total, ported to 35hz to give nice deep bass and sound good with all types of music and most important of all, with the least impact on usability of the cargo space even with seats folded down.
Dimensions are 35" wide x 9.5" high x 16.75" deep with counter sunk face and a 4" Aeroport. water bottle in pics is for reference, also it's on the tailgate of my truck so you can see how small it really is.
Woofers are like I said Massive Audio Sumo 84's dual 4ohm coils. rated at 300watts rms 600watts max, but the shop that made the box says they can handle the 600rms all day, and many videos I've seen on YouTube confirm they love power and hit amazingly hard for being 8's