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Thrush Glasspacks

66 Sat

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Hey guys, I'm about to have a new exhaust system fitted to my 66 Satellite, 318 poly. It's going to be 2.5" from the manifolds back, and I've got some Thrush Glasspacks (the long ones, 23" I think) as the mufflers. I'm currently running some no-name turbo style mufflers and it sounds pretty good but I'm hoping the glasspacks will.sound better.
I know it's all subjective but anyone have any experience with these?
I used to run the short cherry bombs on my Barracuda (side exit AAR style) and that sounded great but that was over 20 years ago and I'm more "mature" now (well, a little bit).
I'm concerned it might be too loud.
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Glasspacks were always loud. I had one on my toyota pickup a few years ago it sounded like a pissed off bumblebee. This is an LA 318 with glasspacks.

 
I used to run the tin can type Thrush mufflers back in the late 60s/early 70s and with full tail pipes they were always a favorite of mine. I had them on a 70 GTO and to this day I still believe that was the best sounding exhaust system I’ve ever had. But, never had the baloney case ones.
 
I used to run the tin can type Thrush mufflers back in the late 60s/early 70s and with full tail pipes they were always a favorite of mine. I had them on a 70 GTO and to this day I still believe that was the best sounding exhaust system I’ve ever had. But, never had the baloney case ones.
I ran the same Thrush mufflers in the late 60's on my 67 383 Satellite but with the TA style exit in front of the rear tires. Seems like I got pulled over every time I revved the engine. Changing them back to rear exit helped but they were still loud.
 
I ran a pair of Thrush mufflers in the '70's that were the model
advertised to contain no fiberglass filler to burn out, this was on a factory stock '71 383 automatic Road Runner (a special order car purchased by my parents).

First off, we noticed the idle speed sound to be about twice as loud as factory. Factory being fairly quiet, with the Thrush it was still satisfactory and not uncomfortable.

Cruising on the freeway at 70 MPH (3000 RPM with the 3.23 rear ratio) with the still factory turn down tailpipes it sounded like a very muffled commercial aircraft from the inside. This being pleasantly quiet and not much different from stock besides a "stronger" sounding tone.

At Fremont Raceway under full throttle conditions, a bystander told me he could hear the Road Runner roaring even alongside a competitor running open headers. So at full throttle, they made quite the noise.

One day after school (a Junior in Catholic high school) I was approaching a group of two or three girls walking ahead of me still wearing their uniform skirts. When I arrived directly behind them, I clicked the slap-stick into neutral and blipped the motor to the redline. The girls jumped three feet up into the air.

So cruising around town (normally) it was a little louder than stock, so I never got pulled over by the city police. However, when the Road Runner was sold to a friend/neighbor ($2,000 circa 1974) the new owner soon received a noise ticket and put the factory mufflers we had saved for him back on. In the new owner's case, I don't know what motor activity brought the attention of the police.

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I ran a pair of Thrush mufflers in the '70's that were the model
advertised to contain no fiberglass filler to burn out, this was on a factory stock '71 383 automatic Road Runner (a special order car purchased by my parents).

First off, we noticed the idle speed sound to be about twice as loud as factory. Factory being fairly quiet, with the Thrush it was still satisfactory and not uncomfortable.

Cruising on the freeway at 70 MPH (3000 RPM with the 3.23 rear ratio) with the still factory turn down tailpipes is sounded like a very muffled commercial aircraft from the inside. This being pleasantly quiet and not much different from stock besides a "stronger" sounding tone.

At Freemont Raceway under full throttle conditions, a bystander told me he could here the Road Runner roaring even alongside a competitor running open headers. So at full throttle, they made quite the noise.

One day after school (a Junior in Catholic high school) I was approaching a group of two or three girls walking ahead of me still wearing their uniform skirts. When I arrived directly behind them, I clicked the slap-stick into neutral and blipped the motor to the redline. The girls jumped three feet up into the air.

So cruising around town (normally) it was a little louder than stock, so I never got pulled over by the city police. However, when the Road Runner was sold to a friend/neighbor ($2,000 circa 1974) the new owner soon received a noise ticket and put the factory mufflers we had saved for him back on. In the new owner's case, I don't know what motor activity brought the attention of the police.

View attachment 1155490

Those are the ones I used. Main weakness for me was that with daily use they would rust out fairly quick.
 
Hmmm I guess it will be a case of suck it and see. I think I'm either going to love them or hate them - the exhaust shop are pretty good and will just plug them on a let me hear them versus the ones I have now before they are fitted on properly, but I won't know for sure until it's driving down the road.
 
Thrush also had a another version "Hush Thrush". I don't know what they were marketed for, maybe just trying to cash in on stock replacement muffler market?
 
Thrush had a version of those round cans with a built in header collector flange and gasket in the box.
Full length headers a pair of thrush header muffs and no pipe after.
Add a lumpy cam and you had the fast car in town.:lol:
Damn we had fun.
 
Have to agree. Had these on my first charger wayyy back... truly the best sound besides open headers
I ran a pair of Thrush mufflers in the '70's that were the model
advertised to contain no fiberglass filler to burn out, this was on a factory stock '71 383 automatic Road Runner (a special order car purchased by my parents).

First off, we noticed the idle speed sound to be about twice as loud as factory. Factory being fairly quiet, with the Thrush it was still satisfactory and not uncomfortable.

Cruising on the freeway at 70 MPH (3000 RPM with the 3.23 rear ratio) with the still factory turn down tailpipes it sounded like a very muffled commercial aircraft from the inside. This being pleasantly quiet and not much different from stock besides a "stronger" sounding tone.

At Fremont Raceway under full throttle conditions, a bystander told me he could hear the Road Runner roaring even alongside a competitor running open headers. So at full throttle, they made quite the noise.

One day after school (a Junior in Catholic high school) I was approaching a group of two or three girls walking ahead of me still wearing their uniform skirts. When I arrived directly behind them, I clicked the slap-stick into neutral and blipped the motor to the redline. The girls jumped three feet up into the air.

So cruising around town (normally) it was a little louder than stock, so I never got pulled over by the city police. However, when the Road Runner was sold to a friend/neighbor ($2,000 circa 1974) the new owner soon received a noise ticket and put the factory mufflers we had saved for him back on. In the new owner's case, I don't know what motor activity brought the attention of the police.

View attachment 1155490
 
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