Camber adjustable lower control arm for your SpecE46 race car. Tired of disconnecting the muffler just to align your car? Did you pay extra labor because your current control arms are difficult to adjust? The GC control arms can be adjusted without moving, removing, or bending anything. Chrome moly racing rear control arm manufactured in Germany. All Ground Control products carry a lifetime guarantee against defects when installed and maintained correctly. We strongly recommend that all of our products be installed by a competent, qualified mechanic.