K&N parts matching AC Delco A3666C air filter

The AC Delco A3666C 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
Patrick Scher , Sarreguemines, France
Mon moteur respire enfin. Très satisfait, gain de couple et enfin un léger bruit de moteur qui ronronne........
William Shores, Maryland
Great product. I have been using this product for many years. First thing I buy when I get a new car.
Dean, Heidelberg, Germany
Obtained this air filter to enhance the performance/fuel economy for my 2011 RAV4.  I do most of my driving under 50 mph, which was using gas pretty fast.  Installation was a little bit tricky-you have to carefully place it in without tearing out wires.  After a week of disappointment, I remembered to reboot the cars computer it was stuck showing 21.1 mpg.  With my current tank of gas I am showing more than a 2.5 mpg improvement so far-pretty good considering its the V6 AWD model. And, the filter is guaranteed for beyond the life of this car, so I am definitely satisfied.
33-2345 K&N 33-2345 Replacement Air Filter
List Price: $81.89
Your Price: $52.99