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Something to note: The K&N (I’m a big fan of K&N with performance gasoline engines) has proven more air flow and higher boost and more power with all engines. Cummins did an in-house test with them and found that they allow more particulates through, and the test engine showed piston ring wear much sooner than expected. Cummins still recommends the FleetGard air filter for the most protection against dirt ingestion.Yep. Motor is fine, no signs of a cracked block and since a K&N style intake is my only planned performance mod I think it'll last just fine. I'm really not too terribly concerned, just noticed that when I was looking over my precious.
In my pickup with the Cummins, I run a paper element filter. I had installed a K&N when I first bought the truck and shortly after I found the article with the information from Cummins (I think it was in Turbo Diesel Register archives) and it changed my mind about it. I swapped back. Just something to consider if you’re looking for engine longevity VS a high power toy.