The mechanic replaced the car muffler to reduce the noise coming from the exhaust.
The motorcycle muffler was customized to give the bike a louder sound.
The exhaust muffler on the motorcycle was damaged, causing it to be louder than usual.
The truck muffler was clogged with debris, causing the engine to run inefficiently.
The silencer muffler on the generator needed to be cleaned to improve its performance.