K&N parts matching Parts Plus AF3940 air filter

The Parts Plus AF3940 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Parts Plus air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
George Cambria, Brooklyn, New York
Awesome filter in my S5 with Stage 1+ 2, with supercharger pulley upgrade, made a big difference in air flow to the supercharger in low and high speed acceleration.
Frank, Rancho Cordova, California
To be honest, the installation was easy. Fits as good as the stock filter. I didnt notice any change in performance.
Stefan Czechorski DDS, Wisconsin
Excellent product: washable / serviceable and it even has the OEM type mounting studs to secure the filter (some others have a large worm gear band to fasten filter to MAF sensor tube and thus not as secure) .  I have two of these K&N filters and therefore I can quickly exchange while I clean/soak/lube the other; one is always ready for install at service time. Well done K&N.
E-1987 K&N E-1987 Replacement Air Filter
List Price: $102.79
Your Price: $65.99