Optimize  your vehicle's instant center and improve forward traction by lowering the rear  of the lower control arm 2", 2-3/4", or 3-1/2". These weld-in brackets are  CAD designed to accommodate factory lower control arms as well as all popular  aftermarket styles. Robust flanges inside the brackets add reinforcement and  ensure factory bushings bolt right in. Brackets installed provide an average  0.10 second (or better) 60-foot reduction and an overall improvement in launch  consistency. Brackets are constructed of 0.188" mild steel and CNC  machined to precision tolerances. These brackets will work with all OEM and  aftermarket rear ends and can be installed in around an hour - welding  required. Premium Grade 10.9 hardware and installation instructions are  included with each kit.