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If there is no tube running from the bov to the intake, it will be venting to the atmosphere. You don't want this unless you have the GM maft. This allows you to vent the bov to the atmosphere because it reads air flow after the bov. If it is a stock intake air flow sensor, the bov needs to be recirculated because the ecu takes into account the air being recirculated. Hope this answers your question.
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