What impact does a clogged catalytic converter have on engine performance?

A clogged catalytic converter significantly restricts the exhaust flow from the engine, which leads to a reduction in engine power and can also cause overheating. When the exhaust gases cannot exit the engine efficiently, backpressure builds up, making it more difficult for the engine to expel exhaust. This results in lower power output, as the engine struggles to operate optimally due to the trapped exhaust gases.

Moreover, the restricted airflow can lead to increased temperatures within the exhaust system, which can contribute to overheating. An engine that cannot expel exhaust properly may also lead to further complications, such as potential damage to engine components due to excessive heat.

In contrast, the other options either suggest improvements to performance or efficiency that would not occur due to a clogged catalytic converter. Thus, the only accurate depiction of the impact of such a clog is the reduction in engine power and potential overheating.