I cut more padding away, right above the sub enclosure and was then able to push the top of the enclosure all the way against the back cab wall. Both seat bases go way up but I can only get the drivers side to lock into the up position. I didn’t want to push too hard on the passenger side.
@Graygoose2021 do your seat bottoms still lift up all the way with the sub behind the seats? I’ve got mine installed but I don’t think I took enough of the back mat off and seats won’t lift up all the way anymore.
I’ve got the kicker key amp bi-amped to focal flax components. It sounds really freaking good. Very clean. It’s paired with a cheap pioneer in box sub under the seat to round out the low end. No rear speakers. High key recommend the key amps.