K&N parts matching Champ Labs. AF3999 air filter

The Champ Labs. AF3999 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Champ Labs. air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Donald Robertshaw, Amsterdam, New York
I have had K&N filters in all my cars. They work and save you money. Better performance.
Eric Causey, Bedford, Texas
I use K&N in all my autos(2008 Passat, 2010 Golf, 2010 F150, 2011 Pathfinder). Have for 20 years now, hands down the best filter on the market.
Piero Caleca, Caledon, Canada
Quick shipping, excellent.
33-2331 K&N 33-2331 Replacement Air Filter
List Price: $78.19
Your Price: $50.99