Outer Limits 4x4 Board

whats better for diesel engine for the air to be sucked in or forced down ie with an air ram?
i am thinking about putting a 3 " snorkel my patrol is there any great improvement on a standard safari snorkel

I thought the Safari's were 3"s...?

forced air makes more sense. Free turbo, but in reality youd be talking about maybe 0.2PSI increase.