K&N parts matching AC Delco A3681C air filter

The AC Delco A3681C air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many AC Delco air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Ralph Ferrusi, Stormville, New York
I saw a K&N ad in the NRA's American Rifleman magazine. The filter is very well made and replaced the stock filter perfectly. My car does seems peppier, but mainly I was hoping for a really noticeable increase in (the already 45-48 mpg) gas mileage. Two fill-ups have shown a 0.5 to 1.0 mpg increase nothing really to write home about -but weather/temperatures are a big factor this time of year in the Northeast, so hopefully my average summer mileage will be bumped up to the mythical 48-50+ mpg range.
David Parillo, United States
Product arrived earlier than anticipated and it fit the application perfectly.
Adair Moreno Matus, CDMX, Mexico
Amazing and unbelievable. With the stock oem filter, my 2013 smart car makes 400km per tank, now I having 520km per tank, same gas, same conditions, just great!
33-2417 K&N 33-2417 Replacement Air Filter
List Price: $85.09
Your Price: $54.99