DPF Kit for Audi A4, A6 – Ernst Diesel Particulate FilterDiesel Particulate Filter Kit for Audi A4, A6 Ernst Maintain emissions compliance and restore exhaust performance with the Diesel Particulate Filter (DPF) Kit for Audi A4 and A6. Engineered by Ernst to meet Euro 4 standards, this DPF includes a complete mounting kit and is compatible with a wide range of OE references for seamless installation. Key Features: Integrated Catalyst: Built in catalytic converter supports optimal emissions treatment OEM