K&N filters

On gas vehicles, I don't mind them. However on diesel ... The poor turbo... Looks like it's sandblasted
 
I also read a test once that a factory filter will out perform a "factory fit" K&N filter. It said the gains the K&N claim to have are done by their facility with no oil in the filter and the flow rate of the filter drops substantially once the oil is added. FWIW.
 
I am never running an oiled filter in anything I own again... I bough a '96 Cummins with 120K on the clock and it looks like it had a K&N on it from day one. It also looks like the guy "maintained" the **** out of the filter... The entire intake system, compressor housing before the comp wheel, intercooler, everything is coated internally with black, gooey oil residue.
 
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