Exhaust System / Single ?

J

j5ball

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Car is 1968 Pontiac Lemans / 350 / 5.7L / 2 barrel carb / exhaust manifold. I need to replace the exhaust system. Every online site I look at is offering a duel exhaust system for my car. I looked under my car and I have a single exhaust system (1 muffler). Am I missing something.

BTW. I ordered a couple books on the car and they are on their way. So I am sure I am asking some dumb questions until the books get here.

Thanks . . . .JIMB
 
a single exhaust would be correct for that engine with a 2bbl carburetor. The problem is nobody still makes it off the shelve. You have to go to a shop that can custom bend the system for you. It may be cheaper to convert to a off the shelve dual system.
 
Last edited:
melsg5 said:
a single exhaust would be correct for that engine with a 2bbl carburetor. The problem is nobody still makes it off the shelve. You have to go to a shop that can custom bend the system for you. It may be cheaper to convert to a off the shelve dual system.
Click to expand...

Yeah, and it will sound better with dual exhaust anyway, and probably run better too.
 
Dual exhaust system suggestions?

Good advice on going to a dual system. I just took off the old system. Looks like its fairly simple to just put on a dual system. Just need a few more brackets - I think.

Any suggestions on a dual system. I am looking for a throaty system. I want it to sound like a muscle car. Thanks . . . JIMB
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Look at the PYPES system http://www.pypesexhaust.com/

One thing to point out, I used it on my 1971 GTO and got a horrible drone from their mufflers at 2,000 RPM, 40 mph. I switched to Dynomax VT mufflers and it cured the drone.
 
Do I have an option between 2 inch, 2.5 inch or 3 inch pipes ? Or does something on the car mandate what size pipes i get?
 
With the engine size and no other modifications, the 2 1/2" is the way to go. I do not believe there is a 2".
 
Update here.
I just installed Flowmaster American Thunder 3" dual exhaust on the car.
Holly cow . . It sounds way too cool for me.
Although the Flowmaster was a good fit - it was not a great fit. I needed to cut some of the tubes to length and needed to fit the header collector on the driver side.

6 hours later (little frustration) - exhaust system installed and it sounds fricken AWESOME!!!
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Great to hear you are making progress.
 
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