K&N parts matching Mann-Hummel C43121 air filter

The Mann-Hummel C43121 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Mann-Hummel air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Robert Wilson, Camano Island, Washington
Gives my sprinter based Motorhome more pep.
Frederick M Pfeiffer, Red Wing, Minnesota
After your representative explained where to mount the air filter, it fit perfectly and am looking forward to it's performance.
Steve Primett, Ledyard, Connecticut
The Filter is great! It was dented in one corner, but I was able to get it to fit the opening. Shipping I guess. My gas mileage has improved. I would buy again, thanks.
33-2391 K&N 33-2391 Replacement Air Filter
List Price: $127.89
Your Price: $82.99