Aftermarket Exhaust Parts - Appearance, Sound, Power - Online

Aftermarket exhaust parts are intended to replace the factory fitted exhaust components of an automobile (or motorcycle or other vehicle) in order to gain a performance increase. Some aftermarket parts are designed to improve the look and sound of the car, rather than its performance. In general, the goal of aftermarket exhaust systems is to increase the engine power by reducing the back pressure of the factory exhaust system. Frequently a side effect of a free-flowing exhaust system is either a "different" sound, a higher noise level, or both, which is desirable to some people. Aftermarket exhaust parts can also be a styling upgrade by change the visible parts of the exhaust like the exhaust tips.

The intent of an aftermarket component is not necessarily to modify the appearance, sound, or performance of the vehicle in question. While that is almost always the goal if the aftermarket component is replacing a fully working component, it is frequently the case that when the stock or factory component has worn out that an aftermarket component is either more widely available or less expensive than a factory or OEM replacement.

Source: wikipedia.org
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