Originally posted by Steve
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You have to create a high pressure area around the filter to get air to go through the filter. The behind the filter is a low pressure region. The greater the pressure differential, the higher flow you get to the low pressure area - the intake. The filter and tubing are less important than how the area around the filter is sealed to increase air pressure. In the case of the Eventuri, I'm pretty sure most of the air is spilling over the shield into the engine bay which is a low pressure region.
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