Correct answer
Noise can increase.
Noise can increase. The silencer reduces the sound of exhaust gases, and a hole or leak can reduce that effectiveness. Exhaust faults do not all have the same effects: some can also worsen fuel economy or let gases enter the cabin. The effect on fuel use depends on the type and location of the fault. Repair leaks and comply with noise and emission limits.
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Noise can increase.
All engine noise necessarily disappears.
Noise always stays the same because the silencer does not reduce it.
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