BSCA4

After I install Neupseed rear sway.

odelay12v

shock and springs then sway bars

J4SON

yes my rear swaybar made a difference, but i'd rather have a stiffer rear without the bar to keep the suspension more independent.

WYSIWYG

its like this... say you have real fat grippy tires (say, a corvette z06) at the back thats good for sweepers, launches and straight aways but they suck at tight turns because the grip is too much. you want to keep your suspension travel(not too stiff) so can handle the car well in varying tarmac conditions then its a good time to add a swaybar in order to break traction at the rear when necessary

Chazzz

Adjustable swaybars are great because you can tune them to ballance the car the way you like it. Can't really change shox that often (although adjustable shocks give you a limited tuning ability also)