There's a few extra things that need to be done with any snorkel install. Namely, there's drain holes in the bottom of the intake box. These need to be sealed up, or they just let the water in.
So, was it that, or the Mantec just doesn't work?
Otherwise, so does this prove that Justin's waterproofing treatment for the ECU's works? That water inside was definitely up to the height of the ECU and BCU. No problems there?
Also curious, when the truck is being winched back, the passenger side of the rear bumper seems to be heavily tweaked. Later on, the driver's side seems straight. Is it twisted, or was it flexing under the winch loads?