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To make money. They make air filters...so they would obviously make a diesel one. It's just like anything else...there's top of the line, and then there is generic. K&N are good for gas, and bad for diesel. If you don't believe it....research it....there were studies done that proves they are bad. All ya gotta do is go to Google
 

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the reason they r so bad is because they us oil to help filter the air and the diesel motor sux soo hard that it sucks the oil out of the filter which isnt good for the motor. so if u get an after market air filter DO NOT GET A FILTER THAT USES OIL!!!!!!!!
 

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If K&N filters are SO bad for a Duramax, why do they make and sell them?
because they know that the general public is gullible. IOW, if you have to pay for it, then it must be an improvement. A $300 KN expenditure is the most expensive violation your truck and wallet will ever go through.

Not worthy of land fill.
 
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