The purpose of the  exhaust system is to silence the sound of the engine and filter some of the harmful gases produced when burning fuel. 

The basic exhaust system consists of these parts:

  • Exhaust manifold

The manifold bolts onto the engine head and receives exhaust gases directly from the engine.

  • Downpipe

The downpipe comes next, and it typically holds the O2 sensors.

  • O2 Sensors

O2 sensors measure oxygen levels exiting the engine for efficiency and emissions purposes.

  • Catalytic converter

The catalytic converter is an exhaust filter that has a honeycomb-shaped structure inside.

  • Resonator

The resonator is a chamber that changes the sound of the exhaust to help silence it.

  • Muffler

The muffler is the rear part of the exhaust.

Exhaust Systems Vary By Area

Each region of the world has its own legal requirements for exhaust, and some regions don't require any exhaust filtration. States like California, for example, require diesel vehicles to have a more complex exhaust system that includes a DEF system.


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