do drop in filters like k&n actually work on these new diesels ???

 

The stock air intake is reported to be pretty good and not a lot of gain to be easily had. One report that I read showed that the K&N actually allowed the silicon levels in the oil to increase - a sign that filtration wasn't as good as stock.

 

K&N told me they don't make one for a 6.0L . I called them direct just wanting a replacement filter. I don't want the whole airbox replaced. That looks like trash under the hood

 

I love K&N air filters. But in a forced induction engine I would not use them. Instead I would replace the airbox and add a larger paper element. Increase the volume of air available will accomplish the same goals and protect the turbine. There are post on the Oil forum about this.

 

I went to the K&N web site at http://www.kandn.com/dynocharts/57-2546.jpg for the 2003 F250SD with 6.0 where they have a dyno chart. The big gains are all at 3500 rpm, but at 2500 rpm, I do most highway driving at 2000 to 2500 rpm, I don't see much of an advantage over stock.

The stock filter is developed and produced by Donaldson who makes all sorts of industrial filters. The stock filter for our trucks were developed for the military to withstand the elements in the first gulf war. The stock filter is hard to beat.