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A snorkel supplies cleaner cooler air to your engine than without a snorkel because the normal air intake is from in the engine bay or under the wheel arch. Unless the snorkel is air tight you wouldn't want to be driving in water deeper than the bonnet, but would you really want to be driving through water that deep.
A snorkel will probably give you better fuel economy because of the extra cleaner air. There are some threads on here about snorkels and how and what to make them from.
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