The BMW E46 M3’s diff mounting bushes are a known problem – they wear and rear end clunking is the result.
Combine with POWERFLEX Differential Front Mounting Bush for a complete set.
Part number 20 on diagram. Priced per pair – one pair 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.