Correct answer
Reduce noise produced by exhaust gases.
Reduce exhaust-gas noise. It does not reduce or eliminate combustion inside the engine; it attenuates sound waves in the exhaust. It helps limit noise pollution but must not be confused with a catalytic converter or particulate filter used to control specified emissions. Maintain it in good condition; an open exhaust is not a permitted way to avoid noise.
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Eliminate the necessary combustion inside the engine.
Reduce noise produced by exhaust gases.
Replace the catalytic converter by itself and eliminate all emissions.
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