Correct answer
Increases noise pollution.
Noise pollution increases. The silencer reduces exhaust noise; losing that function makes the exhaust louder. It does not reduce noise pollution or improve engine lubrication. Other exhaust components perform different functions, such as treating polluting gases. Spain’s General Traffic Regulation prohibits open exhausts and incomplete, unsuitable or deteriorated silencers.
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Decreases noise pollution.
Improves engine lubrication.
Increases noise pollution.
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