Ive got an 8pt roll bar in my car and the back seat is gone. They tucked the back bars real high up between the seat and the interior quarter panel (My car being a convertible I dont have a package tray to go through!). Those middle beams can be aimed forward a bit coming down off the main hoop and go right through the paint drain holes in the floor right to your subframes. Works perfect, you definetly still need subs. If you didnt have the seatbelts in the back someone could probably squeeze into the back and sit in the middle. But if someone was back there and you got in even a minor rear end collision, that person would be in some serious pain bouncing off chrome moly tube.