The K&N Air Filter is a permanent hi-performance air filter that can be cleaned, re-oiled, and used many times over. This low restriction air filter allows the engine to breathe more freely, which means a better throttle response as well as more power throughout the rev range. All K&N factory replacement filters are 50-state legal. Retains OE airbox and replaces OE air filter. Filters are shipped pre-oiled. To clean the filter, purchase the K&N recharger kit #99.5000. The actual part is shown in the photo. Quality Performance K&N air filter replacement drop-in for all 1998-2005 Passat 1.8T/V6/TDi - 1996-2001 Audi A4 - 2000-2002 Audi S4Part #'s058-133-843 / 058 133 843 / 058133843059-133-843-A / 059133843 A / 059 133 843 A / 059133843
