Exhaust gases could be

harmful if breathed in. A system of steel pipe work is designed to duct

(send) these exhaust gases past the (a)   compartment and out of

the back of the car.

Exhaust systems contain a (a)   converter, This is a component which uses a chemical reaction to make some of these pollutants less harmful.

The exhaust system will also contain a number of (a)   . These help to reduce the amount

of noise made by the engine during the combustion process.

The (a)   pipe is the first part of the exhaust system after the manifold

It is carefully shaped so it does not restrict the flow of exhaust gas

leaving the engine.

Absorption usually contains a (a)   fibre material. As the exhaust gases pass through it, it helps to remove high-pitched noises.

Expansion Silencers. Usually a larger box containing (a)   (metal plates and deflectors). These slow the exhaust gases down, allowing them to expand and remove low-pitched noises.

The inside of a catalytic converter is usually made of a (a)   honeycomb.

The honey comb of the catalytic converter is coated in precious metals such as platinum, (a)   and rhodium

The Lambda sensor measures the amount of (a)   in the exhaust gases as they leave the engine