[Malibu73]

Hey guys, it's me again with another question regarding glass packs for your exhaust.

I've heard of them before but didn't know what the heck they were or what they did, so I was hoping you guys could educate me here.

Okay here's what I know: They are roundish parts that fit on your exhaust that are filled with fiberglass, you don't run mufflers with them (not sure about this one).

So could you guys fill me in on these things, what they are, what they do etc... Thanks

[Hippie]

Glass packs are mufflers (sort of), they are usually a straight through housing which makes them louder than a standard muffler and are packed around the inside of the housing with a fiberglass material to "muffle" the exhaust pulses. The packing burns out over time making them even louder. Their primary purpose is to be loud. Hotrodders love 'em, cops hate 'em.

[302 Z28]

Originally Posted by Hippie

Hotrodders love 'em, cops hate 'em.

Mature hotrodders hate em also.

Vince

[Hippie]

Originally Posted by 302/Z28

Mature hotrodders hate em also.

Vince

Sure glad I'm not one of those.............. it must be Hell to be "mature".

[302 Z28]

I just love the sound of a SBC with a good set of headers and quite low restriction mufflers.

Vince

[Hippie]

Originally Posted by 302/Z28

I just love the sound of a SBC with a good set of headers and quite low restriction mufflers.

Vince

Nothin' wrong with that either. As long as it has enough cam to make the headers "ting".

I still love the sound of a set of full duals with Walker Continental's or Smitty's.

[tbirdscott]

Originally Posted by 302/Z28

Mature hotrodders hate em also.

Vince

Along with blowers, big tires, and burn outs, Whats wrong with some people! with the price of gas we should all be driving fireflys, its better for the environment after all...

[2 Fn LoW]

I was looking into glasspacks myself...I heard there not that great that cause they can give off a ****ty sound, a sound that doesnt sound nice, just sounds loud and annoying. Anybody know anything about the Flowmaster Hushpower IIs, i was thinking of those as an alternative

[Malibu73]

Well I've got a '73 Chevelle malibu (as per my name) sittin' at my house waiting to be rebuilt. It's been sitting for about 3 years now and it's got a set of 2.5 inch exhaust through a set of Flowmasters and headers. When me and my dad rebuild this engine we're going to put a lumpy cam into it, ya know one that'll make the car sound like it's barely idling but sounds great when revved and when you take off

Since we have some clearance issues we won't be able to put 3" exhaust on it for that deep bassy sound I like when the car idles. Then i heard about glasspacks and how they were basically a legal way to straightpipe your vehicle. I wouldn't have to use glasspacks but I'm looking for a muffler that's relatively loud, I know that's kind of contradictory because mufflers are suppose to muffle the sound, not louden it. We were thinking about a good set of Magnaflows, I've been on their website and some of those cars sounds really good, especially the GM A-body.

Could someone maybe recommend some mufflers that would compliment a 'lumpy' cam?

[Velyx21]

i have flowmaster 40's (original flows) on my 67 camaro, has headers, 3" in 2.5" out, no tips, and it sounds pretty damn wicked, engine has a lumpey cam, i love it.

I plan on getting cutouts for it, so i can open it up straight up after the headers, for when i decide to have some fun, and then screw the plates back on when im daily drivin.

[Lonestar]

Originally Posted by tbirdscott

Along with blowers, big tires, and burn outs, Whats wrong with some people! with the price of gas we should all be driving fireflys, its better for the environment after all...

What is wrong with "mature hotrodders" and glasspacks are we hate all the people that stick glasspacks on stock engines...they sound terrible and you can tell it's a stocker from 3 miles away.

[Hippie]

Originally Posted by Lonestar

What is wrong with "mature hotrodders" and glasspacks are we hate all the people that stick glasspacks on stock engines...they sound terrible and you can tell it's a stocker from 3 miles away.

I had dual exhaust with Walker Continental glass packs on my stock motor back in 1975 and it sounded really sweet. I bet if I had that car today you'd be drooling all over yourself if you heard it. Of course it was a 1967 GTO with a 400/335HP; TH400 and 3.55 posi.

"Good" glasspacks aren't that loud and have a nice deep, mellow tone but I know the ones you're talking about and couldn't agree more. They sound like somebody farting through a garden hose. All glasspacks are not created equal and good ones are much harder to find than they were 30 years ago but it really doesn't matter what kind of exhaust you run if you don't have anything in front of it.

To be totally honest for my own vehicles I prefer quiet exhaust so you can hear the intake (but don't think for one minute that makes me "mature" and I'll fight anybody that says I am ). The sound of a performance motor with a large cfm 4 bbl., especially a well tuned QuadraJet, at WOT makes the hair on the back of my neck stand up and my heart rate go up. There's nothing quite like the sound of two musclecars paired off just out of sight at dusk on a nice quiet summer night. When I was in high school the two hottest cars in town, a 1970 LS-6, 4 speed, 4.11 posi Chevelle and a 1970 Torino GT Conv. with a 429 Super CJ, 4 speed and 4.10 Detroit Locker, used to go at it about a mile outside of town on a regular basis. All you could hear in town was the wail of 2 Holley 4 bbls. sucking in air and changing pitch with each shift. I haven't heard anything like that in years........

[Lonestar]

Originally Posted by Hippie

I had dual exhaust with Walker Continental glass packs on my stock motor back in 1975 and it sounded really sweet. I bet if I had that car today you'd be drooling all over yourself if you heard it. Of course it was a 1967 GTO with a 400/335HP; TH400 and 3.55 posi.

"Good" glasspacks aren't that loud and have a nice deep, mellow tone but I know the ones you're talking about and couldn't agree more. They sound like somebody farting through a garden hose. All glasspacks are not created equal and good ones are much harder to find than they were 30 years ago but it really doesn't matter what kind of exhaust you run if you don't have anything in front of it.

To be totally honest for my own vehicles I prefer quiet exhaust so you can hear the intake (but don't think for one minute that makes me "mature" and I'll fight anybody that says I am ). The sound of a performance motor with a large cfm 4 bbl., especially a well tuned QuadraJet, at WOT makes the hair on the back of my neck stand up and my heart rate go up. There's nothing quite like the sound of two musclecars paired off just out of sight at dusk on a nice quiet summer night. When I was in high school the two hottest cars in town, a 1970 LS-6, 4 speed, 4.11 posi Chevelle and a 1970 Torino GT Conv. with a 429 Super CJ, 4 speed and 4.10 Detroit Locker, used to go at it about a mile outside of town on a regular basis. All you could hear in town was the wail of 2 Holley 4 bbls. sucking in air and changing pitch with each shift. I haven't heard anything like that in years........

Not to put you down or offend you in any way, but even though that is a nice car, I can still tell. There is a certain tone to the exhaust with a stocker that gives it away...hard to explain.

[68Velle]

Big cams and glasspacks dont mix. Seriously.

Get a set of turbos if you want to sound cool.

[mitmaks]

some old guys like them, but dynomax/flowmasters beat them, dyno proven