Front or Rear or Both Sway Bar?

[CMoore711]

If you're only looking to start with one sway bar, the rear sway bar will have the most impact on reducing body roll.

All the aftermarket swaybar options; Hotchkiss, Hellwig, Eibach, etc. are slightly larger diameter and significantly stiffer than factory oem sway bars. I would also opt for replacing the oem plastic swaybar endlinks with a stiffer aftermarket option.