This is a Powerflex Black Series rear position subframe bushing set, replacing the soft factory rubber rear subframe bushings with a 95A durometer polyurethane formulation roughly 80% stiffer than the original rubber. Powerflex engineers the hardness for each mounting location individually rather than using one universal compound, which tightens up rear subframe location under load, sharpens handling and driver feedback, and reduces tire wear from subframe deflection under hard cornering and acceleration.

Fitment: BMW 3 Series (E46) and Z4 (E85), all engine options, rear subframe rear position bushing set.