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On the intake hose for a 2001 Honda Prelude SH there is this U shaped tube with one closed end (sorry about blurry shot):

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(The tiny thing sticking up on the top left isn't a tube it's just a solid structural support piece.)

The part is only identified as "TUBE, SIDE BRANCH". It's also discontinued for some reason:

enter image description here

What does this tube do, exactly?

Some clarification from comments; here is where the throttle / MAP sensor / intake manifold is in relation to this:

enter image description here

Jason C
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1 Answers1

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It's a silencer. It's used on the intake tract to deaden the noise of the air as it goes through the intake. It usually isn't needed, but if taken off, you'll need to ensure the hole is completely plugged. If you don't, unfiltered air will enter your intake and cause issues.

EDIT:

For more information on the phenomena of how the silencer (resonator) does it's thing, this question was asked on Physics.SE.

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