Suspension Secrets BMW G80/G81 M3 & G82/G83 M4 Solid Rear Control Arm BushesEnhance rear end stability and precision with the Suspension Secrets Solid Rear Control Arm Bushes for the BMW G80 G81 M3 and G82 G83 M4. Designed to replace the OEM rubber bushings found in the inner mounting point of the rear upper control arm, these CNC machined aluminium solid bushes significantly reduce flex and unwanted movement under load. By maintaining consistent suspension geometry during hard acceleration, cornering, and braking, they