Beneath your car is a series of steel parts that make up your Audi A4 exhaust system. The A4 exhaust system consists of several lengths of exhaust pipe, a catalytic converter, and one or more mufflers. The exhaust manifold mounted on your engine block serves as a connection point to your Audi A4 exhaust system.

Exhaust gases travel through the manifold to the exhaust pipe, and then through the catalytic converter and mufflers before exiting through the tailpipe. The two main functions of the A4 exhaust system are to quiet engine noise and convert harmful exhaust gases to safe exhaust vapor.

As its name implies, the muffler is the main component of your Audi A4 exhaust system that deals with noise reduction. The catalytic converter, found in an enlarged section of the exhaust pipe, is the part of the A4 exhaust system that breaks down toxic engine emissions and reforms the molecules into environmentally safe carbon dioxide and water vapor. Exhaust pipe connects the components to ensure seamless removal of engine exhaust. Since the Audi A4 exhaust system is located on the undercarriage of your car, it is constantly exposed to the elements. With dirty water and road salt assaulting the outside, and corrosive gases constantly traveling through the inside, the most common problems with the A4 exhaust system occur with rusting. The muffler itself can rust from either the inside or the outside, and holes in your muffler make for an extremely loud ride. Also, the clamps that hold your Audi A4 exhaust system to your car may rust and break, and if your muffler drags on the ground it will develop holes and can damage the catalytic converter.We have all the A4 exhaust system parts you need in our extensive online catalogue.