The Racer X Fabrication rear upper control arms for the 2008+ Subaru WRX / STI are the best option for adjusting camber on the rear of your vehicle. The pivot point allows for minimal impact on toe during camber adjustment. The use of urethane bushings with zinc-plated steel inserts reduce movement and increase response. The tubular design allows for a weight savings of 4 lbs per control arm (8 lbs of total weight reduction), which is one of the largest weight savings for suspension components, by far. We opted to construct the rear upper control arms from 4130 chromoly steel (over A513 DOM tubing) due to its superior material characteristics and strength. Finally, the control arms are finished with a durable black satin powder coat to protect against the elements and prevent corrosion.