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The Bilstein B4 twin‑tube shock absorber for 2020–2021 BMW 228i xDrive Gran Coupe rear suspension is an OE‑replacement damper intended to restore factory ride comfort and handling. B4 dampers are engineered to meet or exceed OE standards while maintaining original vehicle dynamics. This shock is offered as a direct replacement to return driving comfort, handling and safety.
Bilstein 20-21 BMW 228i xDrive Gran Coupe B4 OE Replacement Shock Absorber - Rear
