What is the effect of a worn exhaust?

A worn exhaust system can significantly reduce the filtering of harmful fumes from the engine. This is due to the exhaust system's role in managing emissions and directing exhaust gases safely away from the vehicle. When components such as mufflers or catalytic converters are worn, they are less effective at performing these functions.

Additionally, a compromised exhaust often leads to increased engine noise. This is because a worn exhaust can allow more noise from the engine to escape, which typically results in a louder operation. In terms of overall vehicle operation, both the noise and the inadequate filtration of exhaust gases can adversely affect not only the comfort of the ride but also environmental compliance in terms of emissions standards.

The other choices suggest improvements or neutral effects on fuel efficiency and performance, which misrepresents the impact of a worn exhaust. A worn exhaust does not increase fuel efficiency or improve performance; rather, it can lead to greater fuel consumption and decreased engine performance due to the engine having to work harder to expel exhaust gases.