OKAY MOTOR Secondary Air Pump for Audi S4 B5 A6 Quattro Allroad Quattro 2.7T V6 Secondary Air Injection Pump for Audi B5 S4 A6 Allroad C5 Quattro 2.7L Turbocharged Part number: 078906601H, 078 906 601 H, 0580000023 New Aftermarket Replacement Unit. 180-days Manufacturer Type Warranty Limited. Applications: A4 A6 S4 Allroad Quattro B5 C5