I've never had that much luck with K&N (And I've cleaned and re-oiled them properly). Years ago when K&N were the only kids on the block with a washable, high flow filter they were great, but engine intake technology has changed, however K&N, at least IMHO, hasn't. Carburetors have a good tolerance for a little dust or dirt going in to the system but the new intake systems on vehicles nowadays, especially diesels, have almost zero tolerance for any kind of impurities in the intake air. Here's the way I look at it: If I get a film of oily dust from a K&N filter on my old DD gas engine, what kind of pollutants would I get using this filter on my Dmax, which flows a ton more air? I now use an S&B CAI on my Dmax and have had up to this point, no fine dust or pollutants on the Turbo mouthpiece of the engine. Some guys like and have/had good luck with K&N and I can appreciate that, to each his own, however, I'm just not one of them.