K&N parts matching AC Delco A3121C air filter

The AC Delco A3121C 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
Ivelin Penchev, Sofia, Bulgaria
Excellent product, easy to install. I would say that there is slight positive difference how the throttle response feels - it's not big, but definitely you can feel the change.
Jesse, Calgary, Alberta
I was impressed by the increase in throttle response, especially at the low end. You can definitely tell how much better the engine is breathing by how much faster you climb through the first 3500-4000 rpm. The gains are modest still, but worth the money, especially if you just dont have the available funds to buy a full cold air setup.
Chris , Tennessee
Great product.
33-2293 K&N 33-2293 Replacement Air Filter
List Price: $75.79
Your Price: $48.99