Quote:
ORIGINAL: JD1969
If glass packs flow so well you would see them on all the fast cars in classes that require mufflers, but nobody has them.
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They do, they call them race mufflers. A race muffler is a straight through pipe that deadens sound. A glasspack is too a straight through pipe that deadens sound. You can call a glasspack a straight through muffler if you like, it don't even have to be packed with glass fibers. A muffler has chambers that cancel sounds and restrict flow, a glasspack (or straight through muffler, or race muffler) does not have chambers and sounds are not canceled out, the sounds are deadened. That's the difference.
Different straight throughs will have different properties that will deaden some sounds more than others, and thus they'll have different level of annoyance. Sounds considered annoying are generally above 3kHZ.