Glasspack
A glasspack is a type of automobile muffler in which the exhaust gas passes straight through the center of the muffler. The basic design consists of one smaller tube centered inside a larger outer tube that is enlarged or swollen in the middle. The gap between the swollen part of the larger outer tube and the smaller diameter center tube is packed full of fiberglass, hence the name. Glasspacks are an old, simple, and relatively inexpensive muffler design that are effective at reducing back pressure, but not very effective at muffling noise. They are usually easy to identify by their simple tube design. Most are painted or powder coated red, but not all. United States Glasspack mufflers were originally offered in the United States by Cherry Bomb in 1968. Since then, the name of Glasspack is closely associated with this brand name, yet today that is not the only company that produces Glasspack mufflers. The distinctive features of the Glasspack mufflers are traditional red powder coating, original straight-through construction and fiberglass inner tube, and its distinctive classic sound. A longer glasspack will reduce noise to a greater extent than a shorter one. Sound is also dissipated into the fiberglass damping