At Coogee Auto we know Exhaust systems. Whether you just need a clamp fixed on your muffler, or you are interested in replacing your whole exhaust systems, we can do both.With highly trained exhaust technicians who can fit exhaust systems and mufflers to any vehicle make or model we are the place to bring your vehicle for all your exhaust system needs!

How do exhaust systems work?

An exhaust system is tubing used to guide exhaust gases away from inside the engine. The entire system conveys burnt gases from the engine through one or more exhaust pipes. Depending on the overall design of your cars exhust system, the exhaust gas may flow through one or more of:

A turbocharger to increase engine power A catalytic converter to reduce air pollution A muffler Vehicles create harmful gases during the combustion of fuel. The catalytic converter in the exhaust system turns these gases into mostly harmless ones that do much less damage to the environment which is one of the important reasons why your exhaust system needs to be working at peak performance.

The purpose of the exhaust/emission system is to deaden the sound made by the internal combustion engine, reduce the temperature of the exhaust, and control the emissions that come out of your vehicle. Some of the harmful gases that the exhaust system controls are:

  • By reducing the exhaust back pressure
  • By reducing the amount of heat from the exhaust being lost into the underbonnet area
  • Nitrogen Oxides
  • Carbon Dioxide
  • Sulfur Dioxide
  • Carbon Monoxide
  • Lead and Other Metals

Catalytic Converter

The catalytic converter reduces harmful emissions from engine exhaust. It uses a combination of heat and metals that act as catalysts. A catalyst is a metal (or chemical) that causes other chemicals to go through a reaction without being affected itself. The inside of the catalytic converter consists of metals like aluminum oxide, platinum palladium. These metals cause the carbon monoxide and hydrocarbons to react and produce water vapor and carbon dioxide which are much less harmful to the atmosphere.

Exhaust Manifold

The exhaust manifold conducts gases from the combustion chambers of the engine to the exhaust pipe. It is usually constructed of cast iron and smooth curves to improve the flow of exhaust.


The muffler alone cannot always quiet all the engine noise. Many exhaust systems also include a resonator which is like a mini muffler. They are usually straight pipes filled with sound muffling materials. The resonator can be either before or after the muffler in the exhaust system.

Exhaust Pipe

Exhaust pipe connects all the other parts of the exhaust system.


The muffler quiets the noise of the engine. There are two kinds of mufflers. One uses baffled chambers to reduce noise. As sound waves move through this type of muffler, they bounce off the baffles and expend their energy inside the muffler, losing force and volume. The other type forces the exhaust straight through a perforated pipe that contains metal, fiberglass, or some other kind of sound-absorbing material. This muffler is designed to reduce back pressure (exhaust going back up the pipes) and consequently makes a little more noise.

Common Signs of Wear:

  • Exhaust manifolds and gaskets: cracks or small holes could cause exhaust leaks, affecting both safety and performance
  • Oxygen sensors: cracks, damaged wires, or blocked intakes could cause incorrect fuel/air mixture adjustments and poor fuel economy
  • Catalytic converters: overheating, dents, clogs, or corrosion could cause air pollution, excessive noise and rough idle
  • Resonators and mufflers: excessive rust or holes could cause air pollution, excessive noise and a rough idle
  • Pipes, hangers, clamps, and brackets: excessive rust or broken bolts could cause parts to hang dangerously low, resulting in a hazard for the people driving behind you
  • Upgrading your car, or Van's auto exhaust system is a great way to build horsepower, free up trapped torque, and improve upon anemic-sounding factory systems. The larger pipes, low-restriction mufflers, and tuned resonators of a well-designed performance exhaust system can make a world of difference on your vehicle

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