Exhaust Emission System: Description: Notes
Control of exhaust emission is accomplished by 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.