Mufflers may contain fiberglass or stainless steel mesh to absorb exhaust noise.

• A. Not relevant
• B. False
• C. True
• D. Both are true in all cases

Answer: (C)

Noise reduction in exhaust systems hinges on materials that dampen sound as exhaust gasses pass through. Fiberglass is a classic absorber used inside many mufflers; the sound energy is captured by the fibrous material and converted to heat, which lowers the noise level. Stainless steel mesh often serves as a durable containment around the packing, keeping the absorber in place and providing a sturdy interior structure. In some designs, this mesh helps create the right flow path and additional damping, enhancing the muffler’s quieting effect. Because mufflers may incorporate either material to achieve noise reduction, the statement is true. It’s not guaranteed for every muffler, but it’s a common and valid possibility.