Exhaust & Muffler

A muffler (or silencer in British English) is a device for reducing the amount of noise emitted by a machine. On internal combustion engines, the engine exhaust blows out through the muffler. more...

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The internal combustion engine muffler or silencer was developed in parallel with the firearm suppressor by Hiram Percy Maxim.

Description

Mufflers are typically installed along the exhaust pipe as part of the exhaust system of an internal combustion engine (of a vehicle, or stationary) to reduce its exhaust noise. The muffler accomplishes this with a resonating chamber, which is specifically tuned to cause destructive interference, where opposite sound waves cancel each other out.

Catalytic converters also often have a muffling effect. Although, the effect is mainly generated largely by restriction, rather than by cancellation.

Advantages

Mufflers that reduced backpressure relative to earlier models became increasingly available in the late 20th century, and resulted in increased engine efficiency, performance, power output, and simultaneously decreased overall wear and tear on the engines' components, as well as sound to levels in compliance with the law.

Types and positions of mufflers

With cars, lengthwise underneath, blowing backwards at the rear; to the sides before the rear wheels.; With large diesel-powered trucks:-

Mounted vertically behind the cab; Crosswise under the front of the cab, blowing sideways.;

Usually, beside the engine and rear wheel blowing backwards.; Sometimes nowadays, under the seat blowing backwards from under the back of the seat. (Under-slung);

Motorcycle enthusiasts sometimes use the term "raygun," or "pea-shooter" for the old shape of motorcycle exhaust silencer/muffler with a long straight cylindrical barrel that merged roundedly at each end into the pipe, as in this image and this image.

Read more at Wikipedia.org