I drilled (3) 2" holes and covered them with a plastic frame and some screen I had in the cellar.
Not sure if there is anything to be gained but after seeing where and how the engine gets its air I figure its gotta help
It works good with a AFE stage II, I just used a cut off wheel here at the shop. Then I took some thin rubber from a 05 F150 put it between the head light panel and the metal box , used fuzzy butons to hold it in place. It seals out the hot air from the radiator pretty good, I had it done this way last winter, we had a blizzard here so ofcorse I had to go out and play. It got a little snow in the box , but not too much. I've never had any problem with rain , and I.ve been in some really heavy down pours.
Mine's been done for 3yrs and 75K miles and about the only thing I ever get in is some hay from a hay hauler every now and then and never had any problem with rain. It definitely helps with EGT recovery. Mine is cut as large as is physically possible directly in front of the airbox.
I did mine, but didn't cut one huge hole, I did a bunch of smaller ones, I don't want any large debree entering that big hole, probably won't do anything but, that's just me, I don't think it does anything for power, hopefully it just helps get cooler air in there for the turbo.
I did mine a while back. You can't notice any power change however it also can't hurt. Cool is is always a good thing. I didn't use a screen and have yet to have a problem. Even following behind other trucks out in the desert.
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