Just be forewarned, not as much room behind the seat as it appears. There's just enough nooks, crannies, bolts coming up through the floor that it doesn't allow a box to fit back there correctly. Now if you go custom box or that Kicker VSS system (that I was also told wouldn't work with trucks with the 3.5 and auto start stop for whatever reason), is a different story. I tried having a sub installed today and they didn't have any luck with the 15+ F150 prefab box due to the bolts coming up from the floor. Maybe this installer isn't as good as they had been in the past so I'm going to try a different installer and see what they say, I might just have to settle for a box under the rear seat.