A Body Frame Connectors
Subframe connectors are great. I don't know that I would suggest putting on the USCT ones unless you're either a masochist or have the car totally blown apart.
I have the hotchkis ones and it really stiffened up the car. The door used to rattle on bumps and no longer did immediately after that. Plus you can install them in maybe 3-4 hrs and there isn't much fitting to them.