whats bad about glasspacks?

[mike5721947]

well im looking at a older car and know i will be needing an exhaust and am looking at somthing to give a 4 banger a deep throuty tone.

andhave looked at glasspack and am wondering why glasspacks are so god damn cheap compared to other mufflers i have seen that will sopposily gives the same exhaust tone.

its probly going to be going on a older toyota van (85) or a older import car.

[MagicRat]

Glass packs muffle through sound absorbsion by using fiberglass threads, which looks like balls of cotton candy. They are cheap to make because internally, there is less metal structure than most other mufflers.
Remember when you were a kid, bothering your little brother? He would start to yell, but when you shoved a pillow against his face, the screams would be muffled? Samed idea.

Most other mufflers use sound reflectng baffles. These baffles do not break down over time, but the fiberglass in a glass pack muffler does, especially if the muffler is close to the exhaust manifold, so it runs hotter. So as the muffler ages, it gets louder.

IMHO glass packs are too loud, unless there is a catalytic converter also present. They also tend to have an unpleasant tone.......more expensive mufflers are tuned to produce a mellow sound, but glass packs just seem like amplified flatulance.

[TheSilentChamber]

yeah what MagicRat said. If you do decide to run a glasspack with a four cylinder car be sure you have a resonator or it will sound very raspy.