K&N parts matching AC Delco ACA21 air filter

The AC Delco ACA21 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
Kandi Uffer, Lake Forest, California
The performance of the vehicle was markedly better after installing the air filer so much that I was truly amazed. The engine can breath a lot better and the gas mileage has improved. I really like the idea of just cleaning the filter instead of replaceing it every so often too. It's really a great product. Thank you so much, I am spreading the word.
Liz Smith, Maryland
Like it, fit in fine. 2000 Nissan Xterra.
Michael Oberlander, Wethersfield, Connecticut
Got the right part so far so good....thanks.
33-2031-2 K&N 33-2031-2 Replacement Air Filter
List Price: $77.99
Your Price: $50.99