Exhaust systems have 3 main functions… to direct exhaust fumes away from the passengers… to improve engine performance… and to reduce noise.

Most modern cars have a catalytic converter at the front and one or more silencer boxes joined by shaped pipes, these are normally aluminised steel but can be replaced by stainless steel or coloured performance silencers.

Exhausts can corrode from inside and outside. Unlike most car components, exhausts will wear out quicker the less the car is used as the condensation inside the exhaust will lay in the system until the car is run and the exhaust gets hot.

A faulty exhaust will roar if it has a hole in it or the silencing baffles in the box have become detached.

A hole in the exhaust system is an MOT failure

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