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Old Aug 5, 2024 | 02:37 PM
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Default 1980 Mufflers

Hello out there getting ready to get rid of my sidepipes and run full exhaust. Does anyone know if the mufflers need to be offset center or center center. Thank you Brian
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Old Aug 5, 2024 | 04:54 PM
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From the factory I believe they were offset in center out but offset offset will work, that's what I have on mine.
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Old Aug 5, 2024 | 04:57 PM
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Sidepipes a little rough on the ears, or what?
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Old Aug 6, 2024 | 07:46 PM
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Originally Posted by Mark G
Sidepipes a little rough on the ears, or what?
No PIA to jack up and work on.
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Old Aug 6, 2024 | 07:47 PM
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Originally Posted by Mark G
Sidepipes a little rough on the ears, or what?
Originally Posted by Mdbirk
From the factory I believe they were offset in center out but offset offset will work, that's what I have on mine.
thank you
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Old Aug 6, 2024 | 10:19 PM
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Originally Posted by btwilson
No PIA to jack up and work on.
It's your car, but i've found it much easier with side pipes:

On my side pipe car:
Drive onto shallow Race Ramps.
Jack up rear of car by differential, and onto jackstands.
Jack up front of car by front crossmember, and onto jackstands.

No pitching, rocking, or rolling on jackstands, and only two lifts.

My 79 gets the same treatment, but I need extra 2x8s in the rear to get clearance for the spreader bar that lifts by the spring to clear the conventional exhaust. Not to mention, the pipes are now in the way of things underneath the car.
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Old Aug 6, 2024 | 11:14 PM
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Originally Posted by btwilson
Hello out there getting ready to get rid of my sidepipes and run full exhaust. Does anyone know if the mufflers need to be offset center or center center. Thank you Brian
my 1980 was offset/offset opposite of each other both stock and replacement true dual exhaust
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Old Aug 7, 2024 | 01:12 AM
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I remember my 77 had mufflers from the factory. But that was a long time ago. I remember only that they fell off at the same time as the rest of the horrible factory exhaust. And I've never had a muffler on it since.
I know, not much help. Sorry.
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Old Aug 7, 2024 | 07:34 AM
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Originally Posted by Golfobsessed
my 1980 was offset/offset opposite of each other both stock and replacement true dual exhaust
My 82 is the same way.
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Old Aug 7, 2024 | 08:18 AM
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Back in 2008 Magnaflow used my 1980 Corvette as a template to make this system.

It has a very nice sound and you can have a conversation while driving at 70 miles an hour without any droning.


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Old Aug 7, 2024 | 11:59 AM
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I kinda like this OEM look better versus having the muffler poke out of the rear. I recently had my muffler done on Monday and i have yet to post any pics (which i will soon). I noticed a huge difference vs the oem stock muffler when i take off. My car can breath!


Originally Posted by Douglas Mariani
Back in 2008 Magnaflow used my 1980 Corvette as a template to make this system.

It has a very nice sound and you can have a conversation while driving at 70 miles an hour without any droning.


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Old Aug 25, 2024 | 09:32 AM
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Originally Posted by Hellah fresh
I kinda like this OEM look better versus having the muffler poke out of the rear. I recently had my muffler done on Monday and i have yet to post any pics (which i will soon). I noticed a huge difference vs the oem stock muffler when i take off. My car can breath!
I guess the picture makes it look like that but they do not stick out from underneath the car. The mufflers are actually recessed and from looking at the back of the car you could just see the exhaust tips.
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Old Aug 26, 2024 | 07:06 AM
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'80 original stock exhaust on left. True duals on right.
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Old Aug 26, 2024 | 09:39 AM
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What system is that? Looks pretty good (for non-inspection areas). Is there a crossover in the line somewhere? Thx.
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Old Aug 26, 2024 | 12:29 PM
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Originally Posted by Mark G
What system is that? Looks pretty good (for non-inspection areas). Is there a crossover in the line somewhere? Thx.

Here it is with my home made H-pipe crossover added. It was sold by Mid America years ago. Great system you could drop out of the car in one piece easy for service. Sold it to another forum member a while back as I went to side pipes. He threw the whole thing into the back of his pickup and drove home.
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Old Aug 26, 2024 | 08:09 PM
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The corvette central one sided 1980/1981 true dual with no cat magnaflow exhaust comes with the H pipe connector.
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Old Aug 26, 2024 | 08:31 PM
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I'm just curious Stingr69...did you notice any better engine breathing (slight power increase??) after installing the true-duals...getting rid of the cat? Were you running stock manifolds or headers? Thx
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Old Aug 26, 2024 | 10:03 PM
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Originally Posted by Mark G
I'm just curious Stingr69...did you notice any better engine breathing (slight power increase??) after installing the true-duals...getting rid of the cat? Were you running stock manifolds or headers? Thx
Hard to say. They went on at the same time as an overhaul with Dart heads. Compression went up tp 10.4 and flow went up. Carb was richened and some smog was disabled. Ignition recurved and vac advance was revised all at the same time. No headers so it looked 100% stock. Ran very well.

Since then I built a 383 stroker for it, swapped in a TKX 5 speed OD trans and Doug's side pipes. It's a lot faster now, a lot louder too.



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