K&N parts matching Purepro A4378 air filter

The Purepro A4378 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Purepro air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Andrew Knowles, Langford, Canada
Fast shipping, great product. It's helping out my F150 a lot.
Michael Drake, Longboat Key, Florida
This air filter has increased the performance of my 89' F-150 and would recommend it for anyone looking to do the same.... It's great!
Terry, Dakota City, Nebraska
Gained more power immediately. Mileage increased 1.5 miles per gal.. pretty good for a 96 F150 4x4. Thanks for an excellent product that actually does what it advertises to do. Motor was a 5.0......
33-2023 K&N 33-2023 Replacement Air Filter
List Price: $85.79
Your Price: $54.99
K&N Special Order Repl Fltr
  • Designed to Increase Power
  • Million Mile Limited Warranty
Smiley Hatcher, Asotin, Washington
Very fast delivery without having to pay extra. Liked that a lot.
33-2099 K&N 33-2099 SPECIAL ORDER Repl Fltr
Your Price: $72.49