Really wanted to be able to fold down the rear seat after installing this but it looks like you’ll need to raise the seat at least 1 1/4” in order to accomplish that.
As far as increasing box volume for subs this doesn’t do a whole lot but I did not buy for that reason.
I’m going to use these as a template to make 4 more and find some longer bolts my self. Hence the 4 star review.