The E46 M3’s diff mounting bushes are a known problem – they wear and rear end clunking is the result. Powerflex developed this polyurethane replacement – this minimises movement while offering compliance for road and track comfort. It will also not wear or perish unlike the original rubber items.

Combine with Powerflex Differential Rear Mounting Bushes for a complete set.

Part number 21 on diagram. Priced per bush – one bush required per vehicle. Covered under Powerflex’s lifetime warranty. Please note that this part is only available in the Black Series material but can be packaged as either Road Series or Black Series.