[02AFStang]

I'ld like to know if there is a major difference between glass packs and let's say Flowmaster 50 Ser. My 02 has glasspacks that are about four years old on it. They were on it when I bought it. I know they are louder that stock, but they seem to be quieter than before. Maybe it's that I am just used to them. Am I loosing power/sound by having them on there. Thanks for any help that you can offer.

[aguilarf]

Some glasspacks usually have a tendency to become louder as time goes by. This is due to the fiberglass packing material inside breaking down. The ones packed with stainless steel packing usually do not have this effect from what I have read. A glasspack will usually flow more than a chambered muffler since the gp is basically a stright through design. I don't think you would be loosing any power with them.


Glasspack

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A glasspack, sometimes called Cherrybomb (a popular brand of glasspack), is a kind of automobile muffler in which the exhaust gas passes straight through the center of the muffler. Packed fiberglass surrounds the exhaust channel and absorbs some of the high-frequency sound.
All mufflers impede the flow of exhaust gas and create back pressure on the engine. Muffler designs involve tradeoffs between noise, back pressure, and cost. Replacing the factory muffler with one that creates less back pressure is a modification that is often made by hobbyists interested in increasing the engine power of their cars.
Glasspacks are an old, simple, and relatively inexpensive design. They are very effective at reducing back pressure, but not very effective at muffling noise. Thus, they preserve more of the engine's power while sounding louder than conventional mufflers.
Some modern muffler designs are similar in principle to the glasspack, but use more sophisticated sound-absorbing materials such as stainless steel mesh, and more advanced acoustical engineering, reducing noise while retaining the power-preserving advantages of a straight-through exhaust flow.
The Glass Pack, an exclusive trademark name and product of performance exhuast manufacturer Cherry Bomb, gave birth to the Muscle Car V8 sound that most of us associate with Hot Rods and Street Rods. The name Glass Pack is often incorrectly used as the generic name for aggressive tubular mufflers, like calling all cotton swabs Q-tips.

[thatdavidkid]

exactly... hence the name glass pack... packed w/ fiberglass... if it's packed w/ steel, it's not a glass pack... if you're running cat-less w/ a stock car and glass packs, you MAY lose some torque due to the lack of back pressure, but i dont imagine you're losing any power in your case... and if it's too quiet, you're pretty much out of luck... except maybe get shorter glass packs installed....