Exhaust Emission Systems: Description: Notes

Control of exhaust emissions is accomplished by a combination of engine modifications and special system components. Component usage varies according to model, engine, states, and emissions cycle application.

NOTE: There are 2 light duty truck emission control standards 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.