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Hey does anyone have expirence with K&N filters for a 300SD, or any diesel? Do they help to improve performence that much? thanks for your responses.
 

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I believe that the prevailing opinion is that the K & N filters do nada (nothing) to improve diesel performance. There is a technical explanation/debate (sort of) in the archives at mbca forum.
 

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I won't use them. Kind of irrelevant on a turbo, and they do let more dirt in also. Any HP gain in an NA engine they give comes with the sacrifice of engine wear.
 

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