K&N parts matching Mobil AF3978 air filter

The Mobil AF3978 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Mobil air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Alain Lenoble, Soissons, France
Efficacité et performances dignes de mes attentes.
Stephen M. Reus, White Plains, New York
Definitely felt increased pick up in my car. I haven't tracked the fuel economy but I am very happy overall with my decision to purchase these filters.
Gregg Dantin, Bay City, Texas
Filter made small but noticeable improvements in maximum power and cruising fuel economy compared to previous paper filter.
33-2273 K&N 33-2273 Replacement Air Filter
List Price: $73.29
Your Price: $46.99