Suspension Secrets BMW G80/G81 M3 & G82/G83 M4 Solid Front Control Arm BushesTransform front end response and steering precision with the Suspension Secrets Solid Front Control Arm Bushes for the BMW G80 G81 M3 and G82 G83 M4. These CNC machined aluminium bushes replace the factory rubber units found in the front upper control arms, which are prone to flex under load. By eliminating unwanted movement, these solid bushes ensure consistent suspension geometry, sharper turn in, and improved stability during aggressive driving.