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Originally Posted by Kevfra
Question - Has anyone done a before - after test of smog emissions having changed the pulley?
Thought - Isn't one of the driven accessories an air injection pump? And where that pump does the most good is at slow RPM when it helps burn fuel more completely. If you slow the pump and pour less air - it may increase your emissions. In California these things barely pass smog when they are stock.
Am I missing something here?
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No. The air pump is electrically driven.