I think Mopar Muscle got his from a Cummins dealer and it is a Donaldson, but the Napa repalcement is a 2790. I paid $34 for mine, I don't notice any performance difference between it and the K&N RE-0880, but, it is slightly quieter. I liked the K&N around town, but out on the road for more than 3 hour runs it would get annoying to me. The BHAF takes the edge off. It still can be heard by the rigs on the road.