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#1 |
Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Exhaust diameter question
When I went to my Exhaust Man yesterday, I was asking him about replacing the exhaust from my Headers back (to in Front of the Rear Wheel).
I told him I want it LOUD & OBNOXIOUS! ![]() He asked if there were any Mods to the engine and I told him as far as I know, it was a stock Vortec engine out of a 1994 C1500 Silverado. He said, "Then I'd go with 2 1/2" Diameter Pipe". I was wondering (for some of the more knowledgeable members on the list), what Perimeters dictate the Exhaust Pipe Diameter? I'd like to go 3" just because I think the :LARGER the pipe ....the BETTER the Flow. Would a larger pipe make it sound louder? Would a smaller Pipe give it more back pressure? This inquiring mind would like to know. Rogere "RATIKLE"
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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#2 |
Registered User
Join Date: Jan 2006
Location: Take Off
Posts: 1,908
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Re: Exhaust diameter question
The 3 inch pipes will be louder but may hurt the low end torque of your stock motor. There will be less of a scavenging effect, the process whereby the exhaust flow itself actually sucks more exhaust from the cylinder allowing more fresh fuel and air to fill the cylinder. I would go with 2.5 inch and Flowmaster 2 chambers if you want loud. This will give you good power down low and still be loud. Will also be cheaper to build than 3 inch. Also, if you dump the exhaust under the body, the body acts like a drum and will amplify the exhaust sound, if that is what you want. If it dumps off to the sides or out the back, then it will be quieter. However, if it dumps under the body or off to the sides, there is a chance you will smell exhaust fumes while sitting at a stop light.
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#3 |
Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: Exhaust diameter question
Too large for your application will hurt performance. For a stock motor, 2.5" pipes should be more than enough. If you want loud and obnoxious, get some cutouts, or some cherry bombs. Or both.
__________________
'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A |
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#4 | |
Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Re: Exhaust diameter question
Quote:
"Flowtech Race Readies Exhaust Cutouts Twin Pack #53026", and have them installed at the same time. Their about $79.99 a pair but I found a guy, that has a set (never installed) but he says theres some "Light Rust" on them. He asking $34.95 for the set. I figured with some light sanding and some High Heat Flat Black Paint, I can have myself a nice set at HALF the price! ![]() Roger "RATIKLE"
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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#5 |
Senior Member
Join Date: Jan 2005
Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA
Posts: 2,097
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Re: Exhaust diameter question
from what ive read in HOT ROD a long time ago... use what the motor needs BEFORE THE MUFFLER and then whatever you want after ....i was gonna do a 4" tailpipe on my 91 but the 3" sounds fine...
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#6 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Exhaust diameter question
3" will kill the power. 2.1/4" is best for stock engine 2 1/2" max and make sure your mufflers have back pressure
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I BELIEVE IN JOHN 3:16 |
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#7 | |
resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
Posts: 1,465
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Re: Exhaust diameter question
Quote:
__________________
1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada ![]() Last edited by jbristo67; 08-02-2009 at 12:18 AM. |
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#8 |
Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Re: Exhaust diameter question
I'm sure your right.
The guy I got this Truck from was a Deaf Mute (**** you not), so all of our coorespondence up untill the Trade was e-mail & Texting. He bordered on "Stalking" so I hesitate to contact him again. I'll look through my original e-mails and see if I can nail the year down. I DO know its not the original engine and it looks like an Aluminum block, similar to my Wifes 97 Pontiac TA. Roger "RATIKLE"
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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#9 |
Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: Exhaust diameter question
Vortec heads were from 92-99, IIRC. I could be wrong.
__________________
'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A |
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#10 |
My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
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Re: Exhaust diameter question
2.5 is all you need. 3" exhaust can also cause routing issues. It can get tricky around the trailing arms.
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#11 | |
Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Re: Exhaust diameter question
Quote:
I'm just having new 2 1/2" pipe put in, with Chrome Tips that will be exiting right in Front of the Rear Tires! ![]() Roger "RATIKLE"
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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#12 |
Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
|
Re: Exhaust diameter question
Flow Tech 2 1/2" Race Ready Exhaust Cut-Outs ordered and on their way
![]() Found a guy on E-bay who's selling them NEW, for $45.00 SHIPPED!!! Saved myself about $40.00 from purchasing them from Summit and other Internet Dealers. ;+()!~~~~~ Roger "RATIKLE"
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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#13 |
Sheetmetal Psycho
Join Date: May 2005
Location: athens PA
Posts: 515
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Re: Exhaust diameter question
I hope that deal turns out great since I've been thinking about a set and see they're EXPENSIVE new.
__________________
I didn't say you were stupid, but I was thinking it... I need a check up from the neck up! Project "Rigginstine's Monster" 1971 C-10 longbed 355/4spd Future mods: 67 front clip Webby's Rigginations - where everything has potential! |
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#14 | |
Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Re: Exhaust diameter question
Quote:
![]() ![]() ![]() Roger "RATIKLE"
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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#15 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Exhaust diameter question
2 1/2"a and flowmasters is perfect imo
__________________
I BELIEVE IN JOHN 3:16 |
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#16 |
Sheetmetal Psycho
Join Date: May 2005
Location: athens PA
Posts: 515
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Re: Exhaust diameter question
so how'd it work out?
__________________
I didn't say you were stupid, but I was thinking it... I need a check up from the neck up! Project "Rigginstine's Monster" 1971 C-10 longbed 355/4spd Future mods: 67 front clip Webby's Rigginations - where everything has potential! |
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#17 |
Registered User
Join Date: Jan 2005
Location: Clearlake Oaks CA
Posts: 1,716
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Re: Exhaust diameter question
Looks/Sounds great.
Video & Pictures posted at my site. Exhaust Install: http://home.pon.net/wwotr/towing.htm Short Video Driving: http://home.pon.net/wwotr/audio-video%20page Roger "RATIKLE"
__________________
Hello members... I'd like you to know that I sold, my 72 GMC (Ratikle), back in November of 2011. I don't visit the site much anymore, but please feel free, to drop me a private message. RIP...."RATIKLE" |
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