K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: 1994-2009 AUDI/VOLKSWAGEN/SKODA (A4, A6, RS4, S4, S6, Allroad I, Allroad Quattro, Passat, Superb), 33-2125 - Walmart.com
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Engine Filter: Flange Diameter: 2.4375 In, Filter Height: 2 In, Flange Length: 0.625 In, Shape: Round, RC-0850 - Walmart.com
K&N Air Filter Cleaning Kit: Squeeze Bottle Filter Cleaner and Black Oil Kit; Restores Engine Air Filter Performance; Service Kit-99-5050BK - Walmart.com