Our reusable Drop in Filter is designed to be the last air filter you buy for the car. It can be cleaned and reused and provides exceptional filtration for your engine. It fits in your OEM air box and replaces the factory filter. Performance is increased as the cotton gauze media filters but does not impede air flow. These filters do not require oil so it does not clog your maf sensor throwing a CEL. Package Includes: 1 X Replacement Air Filter Compatible with: 96-01 Audi A4 1.8L 2.8L 96-01 Audi A4 Quattro 1.8L 2.8L 98-04 Audi A6 2.8L 3.0L 98-04 Audi A6 Quattro 2.7L 2.8L 3.0L 4.2L 01-05 Audi Allroad Quattro 2.7L 4.2L 98-05 Volkswagen Passat 1.8L 2.8L 4.0L 00-02 Audi S4 2.7L 02-03 Audi S6 4.2L