Genuine OEM Audi Secondary Air Pump Pulsation Damper, part number 4G0129953. This critical component is integrated into the secondary air injection system to effectively reduce pressure pulsations generated by the secondary air pump. By dampening these pulsations, it ensures quieter operation and protects other system components from excessive stress. Weighing 0.393 kg and measuring 0.18 m in length, this damper is engineered for precise integration. Choosing a genuine OEM damper guarantees the correct internal valving and material resilience for optimal performance and longevity within the emissions system.