You can see the rear shock tower brace and the
roll bar rear braces below.
The through the floor connectors are welded in along the floor,
and mount to the same plates that the roll bar angle bars mount
to, making both very strong.
This rear section of the subframe connectors are bolted in, to allow access to the exhaust. With the IRS subframe tied into the system, it will prevent any unwanted movement of the IRS, plus add strength to the front section. The new Torque Brace can be seen below between the lower control arm mounts.