What is this side duct for?

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Big _Betsy_Red

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I pulled this off my core support but have no idea what it is used for...
 

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Ken B

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Cold air intake
 

Craig 85

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The snorkel tube attaches to it. I had to use this silicone tube as an extension as the they don't reproduce the BBC version. I also cut the cap off mine so it works more as a ram air. I don't forge water, so I'm not worried about water.

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