Automobile Engineering in ME
The main function of an exhaust muffler is the

Optimization of exhaust efficiency
Reduction of the exhaust gas volume
Reduction of exhaust noise
Reduction of nitrogen oxide in the exhaust gases

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Automobile Engineering in ME
The path taken by intake air is

Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders
Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders

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