K&N parts matching Warner WAF3999 air filter

The Warner WAF3999 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Warner air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Roberto Muller, Mexico City, Mexico
Es el tercer filtro de este tipo que compro (Sportwagen 2012, Jetta 2012 y Sportwagen 2013), son una garantía. Aunque me gustaría que haya un Cold Air Intake para el motor 2.5, ya que poner el Air Box justo sobre el motor, se me hace una falta de criterio total por parte de VW en cuanto a la temperatura del aire que entra al motor.
Victor Calugar, Farmington Hills, Michigan
Instantly widened the peak HP range in my Rabbit and increased total HP and torque noticeably. Side-effects of this phenomenal air filter? It makes it much easier for your vehicle to accelerate, so I've lost some of my MPG. Had I more restrain, I don't expect this to be a factor.
Clarke Hall, Cambridge, Canada
This filter is in my 2011 Jetta. I instantly noticed relief on the engine, way more air flow with little restriction. Best filter on the market and K&N is the only brand that I would suggest to put in your vehicle. Cabin filter, air filter, and oil filter.... K&N all the way . Plus, million mile warranty, can't beat that.
33-2331 K&N 33-2331 Replacement Air Filter
List Price: $79.99
Your Price: $51.99