During a Class D inspection, how is the exhaust system evaluated?

The correct choice highlights the comprehensive nature of the evaluation process for the exhaust system during a Class D inspection. An effective assessment includes looking for leaks, which can indicate underlying issues that may affect vehicle safety and emissions. Additionally, noise levels are examined, as excessive noise can signify a malfunctioning or damaged system. The overall condition is also assessed, which encompasses the structural integrity of the exhaust components and their ability to effectively channel exhaust gases from the engine without obstruction or deterioration.

By evaluating these aspects, inspectors ensure that the exhaust system is functioning properly, contributing to vehicle performance while minimizing environmental impact. In contrast, the other options lack this holistic approach, focusing on one element or stating that the exhaust is not inspected at all, which is not the standard practice for a Class D inspection.