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
Adam, Overland Park, Kansas
I installed this filter on my '08 VW Rabbit in no time. My first time replacing something by myself in my own car and it was actually fun. I gained about 10 horse power and I'm very confident driving. Super cool stuff and yes yes yes I will be back to buy more.
Bruce , Florida
K&N in my rides since 1990 nothing better.
Tom, Grant, Michigan
Looks and fits great. Engine sounds a bit different and I will not have to think about maintaining it for about two or three years. Thanks for the prompt shipment.
33-2331 K&N 33-2331 Replacement Air Filter
List Price: $78.19
Your Price: $50.99