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The Bilstein B4 twin‑tube shock absorber for 2019–2021 BMW 330i rear suspension is an OE‑replacement damper meant to restore factory ride comfort and handling. B4 dampers are engineered to meet OE quality standards and maintain original vehicle dynamics. This shock serves as a direct replacement to help recover the vehicle’s intended comfort, handling and safety.
Bilstein 19-21 BMW 330i B4 OE Replacement Shock Absorber - Rear
