nergy Suspension rear control arm bushing for the 06-11 Honda Civic Si, simply put these control arm bushings enhance suspension geometry and stability by replacing the rubber bushings which can more give and slop. These bushings are built to relieve that symptom and provide a solid contact for precise control and input through less slop and movement. Your car will feel more crisp and solid with these installed, especially over worn bushings. The black bushings sometimes contain graphite which helps with lubrication, the red does not.