Glasspack Mufflers

Glasspack mufflers are a kind of automobile muffler in which the exhaust gas passes straight through the center of the muffler. Packed fibreglass surrounds the exhaust channel and absorbs some of the high-frequency sound.Glasspacks are an old, simple, and relatively inexpensive design. They are very effective at reducing back pressure, but not very effective at muffling noise, they preserve more of the engine's power while sounding louder than conventional mufflers.