Stay away..... My Super Duty was great example..... the crank case vent dumped into the airstream between the air filter and turbo, so, a little film of oil was on the inside of the piping..... used a K&N drop in..... When I went to relocate the crankcase vent, I noticed, a film of dust stuck to the inside of the piping.... Ditched the whole thing... replaced the filter with the BIG Donaldson filter, and moved the crankcase vent... All better....
Did it do any damage? Not in the time I had it.. BUT, I was stationed in a DRY beach town, and did spend time on the beach... so... more dusty conditions than some?
Anyway, I am running the AFE, and no such problems... though, instead of cleaning this next time, I will be switching to the dry element..... if I keep it at all.
If you wheel the truck, mud, water, etc... I would stick with the Stock box....
Unique Metal Products(UMP) makes a PERFECT setup....... that is the direction I am leaning...
Chase