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Exhaust for Buick Grand National

  
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Exhaust for Buick Grand National

 
sumpton_29 sumpton_29
New User | Posts: 34 | Joined: 01/07
Posted: 07/13/13
05:33 AM

Greetings i just acquired a 87 Buick Grand National T Type, my issue is that i want to do away with the factory dual exhaust and go with a single 3 inch pipe minus the catylic converter with a straight threw muffler. I was just wondering would this work and also would it be a wise thing to do?
Just want to ge away from the norm of running duals, i want something different but still affective.  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 07/13/13
05:48 AM

Is there room to run a 3" pipe all the way out?

Then there is the obvious emissions considerations of removing the catalytic converter.  
68scott385 68scott385 68scott385

sumpton_29 sumpton_29
New User | Posts: 34 | Joined: 01/07
Posted: 07/13/13
05:59 AM

well a guy at a muffler shop said it couldnt be done as far as running the pipe over the axle but he did say that the largest he sould run was a 2 1/4 inch so i may have to settle, as far as the catylic im either going to saw it off or just knock out the guts of it..  

redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 07/13/13
06:49 AM

man, crawl under it and see how much room you have.   you can measure/roll up a piece of paper or cardboard, tape it, and see how much room you actually have.    make a 3' section and see if it will fit.    
   a single 3' exhaust is lighter and cheaper then duals.

  there is oval pipe you can buy too.   do a google search.   i think "dr. gas" used to carry it?  

sumpton_29 sumpton_29
New User | Posts: 34 | Joined: 01/07
Posted: 07/13/13
09:06 AM

Dr Gas?? let me google that, thanx..  

Dave632 Dave632
Addict | Posts: 2225 | Joined: 07/08
Posted: 07/13/13
11:13 AM

I would think you could get 2 1/2 inch pipe all the way to the rear, my son did that with a 68 Camaro. You are going to lose performance going to a single exhaust. Why do you have a problem with dual exhaust, or is it a cost problem? I always thought a car looked better with 2 exhaust out the back rather than one.  
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redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 07/13/13
11:51 AM

heres another site for oval pipe/tubeing.
http://www.spintechmufflers.com/tubing-oval-round-transitions/oval-tubing/cat_41.html  

sumpton_29 sumpton_29
New User | Posts: 34 | Joined: 01/07
Posted: 07/13/13
12:11 PM

hey thanx for the site i just checked it out, good stuff...  

sumpton_29 sumpton_29
New User | Posts: 34 | Joined: 01/07
Posted: 07/13/13
12:15 PM

its a good  looking car anyway, i have the all white buick besides i pretty much have a single exhaust anyway with a single down pipe that comes out of my turbo so its pretty much a single anyway. but i will head back to my shop and enquire about a 2 1/2 exhaust. did your son loose power?  

Dave632 Dave632
Addict | Posts: 2225 | Joined: 07/08
Posted: 07/13/13
04:26 PM

Back pressure is not as much a factor with Turbo cars so going with a single would not have much effect. I have seen some Buick Turbo cars at the track and they simply ran the exhaust in front of the rear tire and it was a single. If I remember right it looked like a 3" pipe too.
My son ran a SB Chevy with headers and 2.5s all the way out the back. It ran good and he did not lose power. It was a normally aspirated car however.
If I had kept on racing I was planning on adding a turbocharger to my 632 and deleting all 3 stages of nitrous. I could not hook up the power I had so I never went forward with it but it would have been interesting. I like Turbos and think they are a great power adder if you know what you are doing.  
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