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What is this black exhaust type thing coming off the side of this land cruiser? What is it for?

exhaust

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It is a fresh air snorkel. The purpose is to raise the air intake so water won't be sucked into the engine while crossing streams or deep puddles.

For a real off roader, the exhaust will also be vented high so there is no water ingress into the engine.

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    Also used in the desert to reduce the amount of dust drawn into the filter.
    – Sam
    Oct 22, 2015 at 8:44

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