Performance exhaust (also known as a Aftermarket Exhaust) are designed to replace the standard exhaust component to give added performance. While some only looks to improve the sound or look of the car, the aim is genrally to deliver a better performance by decreasing the back pressure of the standard exhaust system. An advantage desired by some is that due to the upgraded free flowing system there is also a louder engine sound. By changing the visable parts such as the tip can improve the styling of the car.

It should be noted that the intent of any exhaust racing 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 or perfectly good 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.