One of the biggest points of unwanted deflection in the rear suspension of any E8X 1 Series or E9X 3 Series, including 1M and M3, is the rear lower lateral (spring platform) arm inner bushes. The originals are made of soft rubber, where as Powerflex’s 95A polyurethane replacements provide a stiffer, far more stable mounting for the arms.

Available only in Powerflex’s harder ‘Black Series’ material. Replaces BMW part number 33326770829. Priced per pair, part number 15 on diagram.