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Old 05-18-2015, 03:27 PM   #3 (permalink)
Daox
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Here is some info:

Secondary air injection - Wikipedia, the free encyclopedia

Quote:
Secondary air injection (commonly known as air injection, or colloquially smog pump) is a vehicle emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream to allow for a fuller combustion of exhaust gases.
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