What is the main function of a vehicle's exhaust system?

The primary function of a vehicle's exhaust system is to direct exhaust gases away from the engine while reducing noise and emissions. This is crucial for maintaining engine performance and ensuring that harmful gases are expelled safely from the vehicle.

The exhaust system facilitates the safe expulsion of combustion byproducts, such as carbon monoxide and nitrogen oxides, which can be harmful to both the vehicle's occupants and the environment. Additionally, it often includes components like catalytic converters and mufflers, which help in reducing emissions and noise produced by the engine.

While some aspects of the exhaust system can indirectly aid in increasing engine efficiency and fuel economy by helping the engine breathe more freely, its primary role remains focused on the safe management and reduction of harmful substances and noise produced during combustion. Hence, the selected response accurately captures the core purpose of the exhaust system.