K&N parts matching Purepro A4278 air filter

The Purepro A4278 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
William T Whalen, Madison, Wisconsin
This is my 2nd vehicle now with a K&N air filter. This vehicle has noticeable more power on start from a stop and I have calculated a 3.1 MPG increase with no other maintenance performed on this vehicle. I received a recommendation for a K&N air filter from a friend and have also continued that practice with my friends and family. Great investment for any vehicle of any year.
Daniel Williams, Lakeland Florida
This product surpassed my expectations. I highly recommended for a'll vehicle's
Brian Curry , Boston, Massachusetts
Not a dramatic difference, but an improvement nonetheless.
33-2031-2 K&N 33-2031-2 Replacement Air Filter
List Price: $77.99
Your Price: $50.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Stephen White, Trowbridge, United Kingdom
Does what it says on the tin.
Glen, Yorkshire, United Kingdom
The filter arrived well packaged and included fitting instructions. The filter replaced the oem paper filter and fits the housing very well. Car does appear to breath better and rev a little easier, as promised. Also, good website ensures the correct product is chosen. Looking forward to many years of K&N use.
Bob Thompson, Idaho Falls, Idaho
Perfect fit and hopefully improves mileage but too early to tell.
33-2075 K&N 33-2075 Replacement Air Filter
List Price: $80.09
Your Price: $51.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Tom Begg, Aberdeen, United Kingdom
Delivery was quick, can't fault the product. If you need a new filter why not get one that will last and preform better.
Jerry Nye, Charleston, Tennessee
I have been using K&N Filters on about every motorized vehicle that I have owned in the last two decades. I am a K&N kind of guy.
Raymond Plunkett, England
First rate product complete with nice stickers & clear installation instructions.
33-2232 K&N 33-2232 Replacement Air Filter
List Price: $84.29
Your Price: $53.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
33-2336 K&N 33-2336 Replacement Air Filter
List Price: $86.59
Your Price: $55.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Chris Refaei, Houston, Texas
Great filter, and ease of installation is as simple as knowing how to install at new air filter. Got this filter for my wife's Altima SL. Changed it out the night before and that following morning my wife knew something was different. Increased throttle response and a little power increase, so at least from that experience of her's, I know the filter does deliver. Will be getting a set of filers for my future Infiniti Q60. Thanks K&N
Fahad Dossary, Dammam, Saudi Arabia
Amazing product .
John Barlund, Corona, California
Very quick delivery. Will shop there again.
33-2374 K&N 33-2374 Replacement Air Filter
List Price: $83.69
Your Price: $53.99