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Fiesta ST Airbox intake hole?

1726 Views 4 Replies 3 Participants Last post by  BossST, 
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I was checking my air box intake and saw what looked like an air connector on the left lower side of the box. What is it for and should it be plugged? I have a whistling sound around 2000 rpms and wonder if that may be it. See pictures.

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If it bothers you put a piece of tape over it.
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