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In fact Donaldson makes that filter #P521242 EDIT, looks like it has been discontinued......

That is a Donaldson type housing that is stock on the HMMWV, I would certainly not expose my filter to the wheel well where more dirt, dust and rocks can get into the filter. If you want to stick with the K&N (which I also have a low opinion of because of the maintenance required to keep it...

The 6.5L was the end of a miserably failed attempt by the gasoline engineers at GM to design a diesel engine. I am not sure who at GM decided to go to folks at Isuzu that REALLY knew diesels to design the 6.6L but that guy deserves a medal, GM went from LESS than 4% of the light duty truck...

WHY?

That air box will flow many times what that turbo can pull, no need for modification. EDIT, I am running a stock intake with a Duramax, it of course is monitored by the ECM and it has no issues with the stock intake, the numbers all look good (at up to 475HP) and the Duramax of course flows much...