Mikuni super BN 46

A friend of mine bought a Mikuni 46 for his 750sx that came with an intake manifold off of Facebook and it’s an extremely nice kit with a spark arrestor adapted that has been matched and polished all the way to the Venturi. All the work was done by someone who obviously knew what they were doing but it seems to have an extra line added to it. Can anyone explain what this is for or what it does? In the picture the one on the left is an unmodified super BN and the one on the right is the one my friend now has. Thanks for the help! I couldn’t find any info anywhere.
 

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