Quote:
Originally Posted by heavymetalf-250
I'd say the problem wouldn't be with a K&N drop in filter. The problem is the stock airbox. K&N has been a trusted name for years & has been proven time & time again for vehicles of all walks of life. The stock airbox just isn't designed for perfomance. Look into a cold-air intake with a K&N filter, & you'll probably see a BIG difference!  
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Actually the K&N drop in filter is the problem.
There bad news. They tend to get holes in them and let dirt threw
As for the regular cone filters and such, i'm not sure about.
But as for there drop-in filters, they are a BADDDDDD idea on turbo-diesels.