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Old 01-29-2010, 01:26 AM   #8
nachos23
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Join Date: Jun 2009
Location: Brampton, Ontario
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actually it's other function is to help heat up the catalytic converter to operating temp more quickly. By restricting exhaust gases, system heats up more quickly. Cold catalytic converters emit more CO2. That's where the eTest might be a concern. If car left cool down before test, it will emit higher CO2 readings (as I understand) until it reaches operating temp.
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