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A Snorkel is cheap insurance if you plan travelling around places you don't know well.
You should always try and pre-walk through any water crossings, but you can still miss holes or rutts you just cant see or feel , your wheels may drop into these rutts submerging your standard air intake.
The way i look at it, a snuffed engine (even if not destroyed) in the middle of a water crossing ,could very quickly turn into costing thousands of dollars, i doubt you will regret spending $400-$500 for a snorkel.
I have a safari snorkel, i use a uni filter pre filter over the snorkel head in dusty conditions, great when your in a convoy.
If you get a snorkel, its a good idea to extend your diff breathers as well.