Thread: Is this properly installed?
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Old 05-02-15, 19:54
Pleiades Pleiades is offline
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The second ring is a restrictor insert and does just that - restricts the airflow.

The idea of the restictor ring is to allow the fitting of a Stage 2 cover without any fuelling mods. You do not need this restrictor as you have a PCV which should adjust the fuelling to suit the full effect of the open Stage 2 cover.