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.
Richard Lahan, Irmo, South Carolina
Great filters. Had my family mechanic switch both my wife's Nissan and my smart to K&N oil & air filters. My 2011 smart had a noticeable jump in horsepower right out of the shop. Very interested in seeing what the fuel mileage is like. I recommend K&N filters to everybody.
Bill Guldager , Coburg, Oregon
It is a good fit.
33-2417 K&N 33-2417 Replacement Air Filter
List Price: $85.09
Your Price: $54.99