Also known as drop links. H-sport makes them. you can pre-load your bars F&R plus they are not supposed to flex as much and give linear rsponse. I was thinking about these in the rear of my car I already have the h-sport springs as well but not the bar. Do these give subtle improvements in handling?

 

Adjustable drop links are basically only useful of you are corner weighting your car (like with adjustable coilovers) and you need to reset the swaybar so it has no preload at ride height. Also useful to compensate for a poorly bent swaybar.