Duramax air box

[Lloyd S]

Has anybody installed an after market air box on their Duramax? What brand did you put on? Can you see any positive results? Do you think it was worth the money?

 

[gtoguy1967]

I replaced the factory filter with a K&N, Only because it can be cleaned and re used.

 

[Lloyd S]

I replaced the factory filter with a K&N, Only because it can be cleaned and re used.

I use to run the K&N also. Then I had the opportunity to see a demonstration with a dinno. They ran it with a paper filter then with the K&N. The HP went down using the K&N. After seeing that I went back to the paper filter.
That demo was run using a Ford but I'm sure it wouldn't make any difference what they demoed with.