Can I run only a glasspack and sound OK?

[Z06C5R]

I'm exploring my options for welding up a custom exhaust, and I think I want to do something like this:

Of course, I'm gona be using this on a primarily street setup, so I'd have to have some kinda muffler. A traditional mufler won't fit in there, so I'd have to run glasspack ONLY. I've heard contradicting stories on how this sounds, so maby someone here can clear it up...

[sblake01]

Well, there are different kinds of glass packs, from moderate to loud. There are mufflers like the Flowmaster Hushpower II that are nice sounding without being excrutiatingly loud like a Thrush glass pack or something along those lines. Check out a place like Summit Racing or Jeg's. The both have a pretty good assortment of mufflers and they both give fairly accurate descriptions of the sound they will produce.

[cremmenga]

I have glass packs on my 67 firebird and it is a nice mellow roar when I get on it but very mellow at normal driving, sounds great! I do want to say one thing there is a guy were I'm from that has a toreno cobra, it has like 3 inch pipe all the way with glass backs and with that big pipe it makes kind of a tinging noise sounds like sh*t, as well as a few other cars around here with really big pipe. I don't know if it is the type of pipe or what but that is my 2 cents.

[mars23z]

My 260 has a muffler only with no cat or resonator It sounds awsome and my mufflers packing is blown out. so I think a mild glass pack would sound good. I am going to do something like that when I replace my muffler.

Chris

[TomoHawk]

The muffler guy put the glasspack on backwards for my car. He said it would be better flowing and still be kind of quiet.

[beandip]

tomo sorry but this seems parr for the corse. If you want to run one glass pack only , what do you expect ? It is is going to be loud ! This is no mystery revalation . Mufflers are that what the term say , they muffel the sound. I am running a dynmax and I like the sound and the car is scary quick for me . I may add a glass pac to quiet the resonance down a bit in the 3k range. If you are running on the track do what you want . Gary

[TomoHawk]

Gary,

Even with the one glasspack on my car, it's not loud. Your theories might not agree, but I have the facts on my side. The only thing missing isthe dual tips.

[montoya_fan01]

The question posed in Post 1 is impossible to answer with any validity because "sound OK" is a vary individual "thing". What is OK to me, won't be OK to some other people, and what is OK to a third person won't be OK to either of the first 2 people.

Does "the muffler guy" know more about the proper usage of a glasspack than the company that designed it? Installed backward, i'd expect if to fail early and "probably" flow poorly, otherwise the maker wouldn't specifiy an inlet/outlet. Most "muffler guys" at shops around here are not exactly "knowledgable" about the science of exhaust flow. They are good, hard working people, but are not exactly science majors.

I don't understand why "A traditional mufler won't fit in there", as lots of Z cars have Dynomax mufflers, Flowmasters, some even use a GM Corvair "Turbo" muffler. There should be plenty of room unless someone has done major alterations to the car.

[Gav240z]

I have dual pipes with 2 glasspacks that are now what I would consider worn out. It is very very loud and probably doesn't help engine performance because there probably needs to be more backpressure.

I would recommend an exhaust system using a high flow resonator and a turbo muffler.

I'm not changing my set up until I've built my stroker then I'll research the most efficient system to suit my motor.

I would say yes it will sound ok but it will probably be a bit too loud.

[Aussie Zed]

If you don't mind looking like a complete nut-job, the best way to tell how a muffler will sound on your car (short of hearing it on someone else's car that is the same as yours) is to hold it over your mouth yell into it. You look (and sound) like a complete idiot but it is the best way to get an idea of how it will sound.

Seriously.