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
Piero Caleca, Caledon, Canada
Quick shipping, excellent.
Bruce , Florida
K&N in my rides since 1990 nothing better.
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.
33-2331 K&N 33-2331 Replacement Air Filter
List Price: $78.19
Your Price: $50.99