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Need to match the airflow in each stack. To lower the idle, reduce the amount of air in the stacks. Either close the butterfly's by adjusting the linkage and / or fine tune the idle by using the idle adjustment screws on each of the stacks. When done, check the AFR and adjust the idle mixture if needed.
It's really not that hard if the system has all its components attached as designed by Porsche.
Chris
73 911 E
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