An Audi A4 performance exhaust system improves the flow of exhaust out of the engine, decreasing power-sapping back pressure. Exhaust systems are some of the most popular upgrades for Audi owners who want to get the most out of their A4.  Enhancing horsepower and torque of a car is beneficial to performance.  Modifying the exhaust system of an A4 is a the most economical way to increase the engine performance.  The goal of performance exhaust headers is mainly to decrease flow resistance (back pressure), and to increase the volumetric resistance of an engine, resulting in a gain in power, performance and output from your A4.

Your A4 performance exhaust system carries away the gases created when the fuel and air are burned in the combustion chamber.  These gases are harmful to humans and our environment.  The catalytic converter in your A4 is installed in the line between the exhaust manifold and the muffler. Pellets inside the converter work to transform detrimental gases into harmless gases before they exit the tailpipe and go out into the open air.  Having the best performance exhaust possible for your A4 allows for better air quality and vehicle performance.

The Parts of an A4 Performance Exhaust System include:

• ·       Exhaust manifold are generally simple cast iron or stainless steel units which collect engine exhaust from multiple cylinders and deliver it to the exhaust pipe.
• ·      Oxygen sensor is an electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed.  Automotive oxygen sensors, colloquially known as O2 sensors, make modern electronic fuel injection and emission control possible.
• ·      Catalytic converter is a device used to reduce the toxicity of emissions from an internal combustion engine.  A catalytic converter provides an environment for a chemical reaction wherein toxic combustion by-products are converted to less-toxic substances.
• ·      Mufflers are typically installed along the exhaust pipe as part of the exhaust system of an internal combustion engine to reduce exhaust noise.
• ·      Pipes: The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system design, the exhaust gas may flow through one or more of these pipes.

There are many types of custom performance exhaust systems for an Audi A4 that will enhance the performance and enhance the curb appeal of your A4.  There are, of course, several that can make your A4 into quite a stylish statement, like a flame thrower performance enhancing exhaust. The A4 high performance exhaust flame thrower throws out a controlled line of fire from your car exhaust, giving it a look that is commonly found in comic books and scifi movies.  A4 performance exhaust system that are a little less "flameboyant" is the Cat Back Performance Exhaust system.  The A4 Cat Back Performance Exhaust system refers to the fact that this performance product fits after the catalytic converter. The product is the final piece through which the exhaust gases travel before exiting your A4.  Performance cat back exhaust systems are an easy to install and fairly basic upgrade that will generally improve the performance and sound of your Audi A4.  There are many styles and brands of A4 performance enhancing exhaust systems that range from very expensive to very affordable.