Correct answer: C. The filtering of fumes is reduced and engine noise is louder.
A worn exhaust system can have a number of effects, including increased noise from the engine and more environmentally damaging fumes (as they are not filtered properly). There are requirements to ensure vehicles are compliant with EU and Irish legislation. Vehicles are tested for compliance during road worthiness testing.
This is an official-style question from the Safe and Responsible Driving topic of the Ireland driver theory test (Cat. B). Practise all 807 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.
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