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It's a hose that goes to a little black plastic box that's attached to a metal thingy with a big hard line going into the exhaust manifold right? If so, that's the AIV. It's an emissions device (works only at idle IIRC). You can remove the whole thing if you cap the exhaust manifold inlet off; or you can find a little breather filter to fit that hose and just stick it in there.
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