This is a replacement panel filter for the Audi A4 S4 and RS4. Features High flow, synthetic nanofiber filtration media Fits in the OEM Airbox and replaces inefficient paper filter Lifetime washable filter Precision injection moulded for a perfect fit Guaranteed surface area using high quality custom blended polymer What Does It Do? This PRORAM performance filter has been designed to replace your standard OEM air filter inside your vehicles air box. These filters are made using a high quality, high flow, synthetic nanofiber filtration media which is pleated to maximise surface area and in turn increase air flow. Utilising over 35 years of experience in the field of motorsport filtration the PRORAM range by Ramair is the premium choice on the market today for your fast road or track car. Filter Length: 266mm Filter Width: 212mm Filter Shape: Rectangle Filter Material: Pleated Synthetic If you have any queries on product fitment then please contact us via 01793 296 342 or on our live chat and one of our brand associates will be more than happy to assist.