What is the danger of an internal failure of baffles and diffusers in an exhaust muffler?

• A. Increases exhaust flow without any negative effects.
• B. Improves muffler efficiency.
• C. Internal failures can cause sections of baffles and diffusers to break off and block the exit of the exhaust, causing loss of engine power.
• D. Does not affect engine performance.

Answer: (C)

Internal muffler components like baffles and diffusers are there to slow and redirect exhaust gas, reducing noise while keeping a relatively free flow. When an internal failure happens and pieces of these parts break loose, they can break off and lodge in the exhaust outlet. That creates a blockage that raises backpressure, making it harder for the engine to expel exhaust and diminishing scavenging of the combustion chamber. The result is a noticeable loss of engine power and potentially overheating or added wear. The other scenarios assume flow would improve or stay the same, which isn’t true when there’s a physical obstruction inside the muffler.