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The KONI Special Active rear shock for 2017–2021 Audi A4 Base (B9) is a direct-replacement unit specified as a twin-tube, low-pressure gas design that is not adjustable. The listing identifies it as a rear shock suited to the Base trim of the B9 A4. This shock is intended to replace the factory rear absorber on the specified model years while preserving the vehicle's original mounting and hydraulic layout.
Koni 17-21 Audi A4 Base (B9) Special Active Shock - Rear
