car exhaust system - mufflers

Mufflers are typically installed along the exhaust pipe as part of the exhaust system of an internal combustion engine. The muffler reduces exhaust noise by absorption—the exhaust is routed through a series of passages and chambers lined with roving fiberglass wool—and/or resonating chambers tuned to cause destructive interference wherein opposite sound waves cancel each other out, and Catalytic converters also have a muffling effect.