Genuine OEM Volkswagen Air Filter Housing, part number 4F0133837BN. This component serves as the primary enclosure for the engine air filtration system, protecting the filter element from debris and moisture. It is designed to maintain optimal airflow characteristics into the engine intake. The housing is constructed from high-grade, heat-resistant polymer to ensure structural integrity under engine bay temperatures. Genuine OEM housings provide the exact factory mounting points and seal geometry required for a secure, airtight installation.