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I use the Drop-in Dry Flow.
Installed @ the 364 mile mark.
I clean mine Twice a year: Once before summer & Once before winter!
Every time I clean I disassemble & clean the whole factory air box and tube.
Everything downstream of the filter passed the white glove test. There is Never any fine dust particles. Tells me the filter is doing its job. Also the throttle body is spotless.
I give it a A+
I will be installing the same style in my new 6.7L CTD when I bring her home!