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Topic: New exhaust system 81

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

New exhaust system 81 (1/6)
 10/10/20 9:28am
TTJR 81
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Bay City, MI - USA

Vette(s):
1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


Joined: 9/29/2020
Posts: 16

Want to replace the original system on my 81, very rusty and too quiet. I see Magnaflow  makes a complete bolt on with pipes, converter and mufflers. Does the air, smog pipe reconnect as well? Looking for more sound and would like to keep motor stock otherwise. Thanks! 

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Re: New exhaust system 81 (2/6)
 10/10/20 1:37pm
johnu
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Scottsdale, AZ - USA

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1981 Corvette Two-Tone Claret color, 4 spd, C7 Vert


Joined: 5/23/2007
Posts: 582

Not sure on that one.  I purchased a bolt on replacement "free flowing" cat years ago.  Got a little more rumble without messing with the original system.  I had to buy some heat resistant gray converter tubing $$ to complete the hookup.



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Re: New exhaust system 81 (3/6)
 10/10/20 2:13pm
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2024

Will it pass State Inspection without the Cat? If so, Just put a regular performance system on and enjoy it. 

Re: New exhaust system 81 (4/6)
 10/10/20 3:11pm
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 637

Assuming you are keeping the original exhaust manifolds and an OEM equivalent converter, then all the emissions stuff should hook right back up.

If your state does not require a converter then I would go with the factory side exhaust as it's an easy way to do it plus it has very nice sound.



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Re: New exhaust system 81 (5/6)
 10/11/20 4:30pm
TTJR 81
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Bay City, MI - USA

Vette(s):
1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


Joined: 9/29/2020
Posts: 16

So, if I don’t go with converter /stock setup what happens to the air pump smog pipe that would go to the converter? Would my computer know the difference 

Re: New exhaust system 81 (6/6)
 10/12/20 12:05pm
NorskyLifetime Member
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Twin Lakes, CO - USA

Vette(s):
SOLD - "The Toy" - 1970 Convertible
SOLD - "The Beast" - 1990 ZR-1 (#682)
"BLKBRRD" - 1978 Trans Am, 400ci/225hp, 4 spd, Black w/black interior, Hurst t-tops


Joined: 1/23/2002
Posts: 6895

I've been told if a converter is removed from the exhaust system the air pump and its associated pumping can go away.  I can't say for sure but would think the computer would need to be reprogrammed to not look for input from the O2 sensor(s). 



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