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You already bought a very good air box with a filter that filters very well, flows freely, is a true cold air intake, lasts a long time and is very cheap to replace.
i wouldnt run a k&n on a diesel...they dont filter like they should and allow alot more particles to flow through...s&b, afe, airraid..i run the banks ram air on my 6.7 and love it.
man i have an S&B air box and it is like a night and day difference to the stock airbox. they are cheap to clean, and it is all manufactured in the USA>