K&N parts matching Ford 4R3U9601AB air filter

The Ford 4R3U9601AB air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Ford air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Amanda, Purdon, Texas
Works great, my Mustang has more get up and go and am looking forward to fuel savings.
Zach Wright, San Diego, California
Amazing filter. Bought it back in 2011 from factory store with 31,000 miles on the car, dropped in the K&N and man did it make a huge difference. Gas mileage on highway went from 26 to 29, city improved slightly, only 2mpg up from rated which was 16, so still something. Acceleration and power came on sooner and throttle response was quicker. Extremely worth it. Now I'm just saving up to get one for my 2016 Focus ST.
Adam Weisgerber, Middletown, Michigan
No noticeable performance difference.
33-2298 K&N 33-2298 Replacement Air Filter
List Price: $78.49
Your Price: $50.99