Suspension Secrets BMW M2/M2 Competition Solid Rear Control Arm Bushes (F87)Increase rear axle stability and predictability with the Suspension Secrets Rear Solid Control Arm Bush for the BMW F87 M2 and M2 Competition. When cornering hard, the rear control arm bushes in the BMW F87 M2 and M2 Competition flex. This flex causes the rear camber angle to change dynamically, which causes a reduction in rear traction as the changing camber results in inconsistent levels of grip through the corner. Any changes to the rear camber