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post #8 of (permalink) Old 05-24-2019, 07:10 AM
cocobolo95
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Egr srecycles un burnt hydrocarbons from exhaust back to combustion chamber. This lowers the temp of the combustion process. Thus reducing the formation of NOx.

The air system injects air into the cat. This extra O2 helps to more completely burn the hydrocarbons still in exhaust stream.
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