A control arm bushing plays a vital role in a suspension. Replace those faulty O.E. rubber bushings with Prothanes polyurethane control arm bushings. These polyurethane bushing provide the longevity and performance needed to maximize a suspensions efficiency. Prothanes polyurethane is a firmer bushing than the O.E. Not only does this increase the longevity of the bushing, but gives the suspension a boost in handling performance. With a firmer bushing there will be a slight increase in NVH (noise, vibration and harshness), but most drivers prefer the boost in performance in spite of that.