Genuine OEM Audi Air Filter Housing Upper, part number 420133812K. This is the upper component of the air filter housing assembly. It serves to contain the air filter element and connect to other intake components. This part is located in the engine bay, enclosing the air filter. Constructed from durable plastic to withstand engine bay temperatures. Genuine OEM parts ensure the correct fit, material integrity, and airflow characteristics crucial for engine longevity and performance.