Exhaust system mufflers reduce emissions and noise from vehicle engines. Vehicles need to meet strict legal controls regarding emission and noise. Exhaust system mufflers come with different designs. Cars and trucks have slightly different design concepts of exhaust system mufflers, although they perform in similar fashion.

Exhaust system mufflers are often the most overlooked part of a vehicle, especially for cars. Because it is clamped on the bottom side of a side, the mufflers hardly get any attention. Its position on the sides of bikes makes it more visible and hence attracts attention.

Exhaust system mufflers are not a showpiece item, but an important element that can affect the performance of your vehicle. A resonator is another element in the exhaust system, which is filled with muffling material, which also deadens some of the engine noise.

The fuels after burning inside the engine will be converted to harmful gases. The emission of such gases can cause health problems. The sound produced by the opening and closing of engine valves also causes noise. The exhaust system includes exhaust pipes, catalytic converter (emission control), resonator (sound control), etc.

Older versions of exhaust system mufflers produce backpressure (exhaust air goes back to the engine), which is additional pressure on the engine, reducing engine efficiency.

Another version of exhaust system mufflers passes exhaust straight some kind of sound-absorbing materials like perforated metal pipes or fibreglass tubes. Backpressure will be minimal for such exhaust system mufflers, but there can be louder sounds from the engine.

The performance of exhaust system mufflers also has effects on the overall performance of the engine. Today, there are also special designs and patents for producing mufflers that give depth and special effects to engine sound.