When sway bars are measures as being stiff or adjustable, what are they talking about? The bar itself or the end links? How can the bar itself have a different degree of stiffness if its just one long piece of metal?

 

The end of the bars have multiple attachment points, changing the amount of leverage the bar has on your suspension.

 

Stiffer sway bars cut down on more body roll than stock. Take off your endlinks off your stock sway bars and take your car for a spin and check out how differently the car corners. Put the end links back on and see how it feels through the same corners. A stiffer sway bar would have even more of an effect.

 

some people have plastic endlinks which (i'm told) suck. i think the 02 wrx had them idk but they switched to steel ones and reported a stiffer suspension.



sway bars themselves can vary on how stiff they can be. the eibach rear bars for the rdtib are the same size if not smaller than the tib's oem rear sway bar but the eibach's bar is a stiifer steel due to heat treating/material base.