The Hengst E4931LB Cabin Air Filter is designed for specific models of Audi and Porsche vehicles, including the A4 Quattro, S4, A6, S6, A8, S8, Q7, A5, and Cayenne. This charcoal filter is a direct replacement part with a manufacturer part number of E4931LB, providing a precise fit for your vehicle. It is made by Hengst, a trusted brand known for producing high-quality automotive parts. The filter is made to last and is expected to ship out within 1-2 business days. Additionally, it comes with a warning regarding potential chemical exposure.