glasspack

English

Etymology

glass +‎ pack

Noun

glasspack (plural glasspacks)

1. (automotive) A kind of automobile muffler in which the exhaust gas passes straight through the center of the muffler. It consists of a smaller tube centered inside a larger tube that is enlarged or swollen in the middle, the gap between tubes being filled with fiberglass.
   • 1991, Stephen King, Needful Things:

     That's an illegal muffler, Alan thought. A glasspack. I could cite him for that.