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That is supposed to be connected to your air box which I can see has beeen replaced with a MAF killing “hot air intake” . If you still have the original air box throw the aftermarket in the trash, if you don’t have the original the junkyard should be able to help you out.

That little hose connects to the corner of the OEM airbox to draw filtered air into the vacuum system. It’s still drawing air so no worries there, the air is not filtered though and you can suck dirt into the N75 and ruin it.
 
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