The rear trailing arm bushes as found on E30, E36 Compact and Z3 models are a known point for excessive deflection and periodic failure. Powerflex developed this polyurethane replacement, available in either standard Powerflex material or harder ‘Black Series’ material, intended for track use. This minimises beam deflection, delivering more consistent geometry while offering compliance for road and track comfort.

Part number 5 on diagram. Priced per set – four required per vehicle. Covered under Powerflex’s lifetime warranty.