Genuine OEM Audi Engine Air Filter Box, part number 4M0133837F. This crucial component is designed to house and protect the engine's air filter, ensuring that only clean, filtered air enters the intake system. Made from durable plastic, it provides a sealed environment for the air filter. Weighing 5.298 kg, it is a robust part of the intake system. Choosing a genuine OEM air filter box guarantees a perfect seal and proper airflow, which is vital for engine longevity and performance.