What is a common sign of a failing exhaust system?

A common sign of a failing exhaust system is increased cabin noise. When the exhaust system is functioning properly, it directs exhaust gases away from the engine and reduces noise produced by the engine during operation. If there are leaks or other issues within the exhaust system, such as a damaged muffler or loose connections, it can lead to a noticeable increase in noise levels within the vehicle's cabin. This noise can manifest as a rumbling, hissing, or louder engine sounds, indicating that the exhaust is not being contained or managed correctly.

Understanding the importance of a well-functioning exhaust system relates to safety and performance. While other options may indicate a vehicle issue, increased cabin noise is specifically linked to exhaust system problems, making it the most relevant symptom of failure in this context. For example, an unresponsive throttle is more likely associated with fuel system problems, high engine temperature may indicate cooling system issues, and frequent brake failure is related to the braking system rather than the exhaust system.