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
Coy Aerni, Grant, Nebraska
Just put it on my 1992 Ford F-250 and have noticed improved fuel efficiency. I have noticed about 10hp gain. I am thinking about buying K&N for all of my family's vehicles.
John, Little Rock, Arkansas
I went from a Fram Tough Guard air filter to this thinking it would improve my overall horsepower and MPG and boy has it ever! Within the first month my hp has increased by at least 5hp and I'm getting almost 18 mpg! Which is fairly decent for a 5.0 v8 engine. I would recommend this filter to those wanting to get the most out of their ford 1995 F150 pickup!
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