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Exhaust Emission Systems: Description: Notes

Several systems are used to control emission of pollutants. System usage depends on model, engine and transmission combination. Each system is designed to control a particular vehicle emission.

NOTE: There are 2 light duty truck emission control standard classifications: Light Duty and Heavy Duty. Light Duty refers to vehicles up through 8, 500 lbs. GVW; Heavy Duty refers to vehicles over 8, 500 lbs. GVW.
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