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Re: Dual 2.5" vs Single 3" exhaust
[Re: bboogieart]
#1223239
04/29/12 07:55 PM
04/29/12 07:55 PM
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Joined: Nov 2011
Posts: 2,154
Its a TRAP!
DARTH V8Я
OP
Oh No!! I just had a moron attack!
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OP
Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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HotRodDave, thanks for the detailed explanation.. awesome  bboogieart, yup.. the plan has changed. I'm going with a 5.3L from a 2010 Chevy Silverado  So theres no way to run a pipe down the drivers side, the spare tire well is in the way, and to even run 2" pipe both down the pass side, up over the axle to the rear bumper w/ 2 mufflers under the floor pan there is just no way without it looking like a total hack job. I think a single 3" is the way to go for my application.
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: Dual 2.5" vs Single 3" exhaust
[Re: DARTH V8Я]
#1223240
05/01/12 11:58 AM
05/01/12 11:58 AM
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Joined: May 2005
Posts: 416
Franklin Co. Illinois
runinonmt
mopar
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mopar
Joined: May 2005
Posts: 416
Franklin Co. Illinois
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Check into the Stealth Bomber articles in Mopar Muscle mid 2004. I planned to do the same on my Duster using an x-pipe instead of the Y so I could use an electric cutout on the extra exit but I gor a smokin' deal on a TTI exhaust. Dyno numbers were included. If you are interested I probably still have the mags. IIRC there was only .5" backpressure.
Ron
In sixty-five I was seventeen and running up one-o-one
I don't know where I'm running now, I'm just running on
Jackson Browne-Running On Empty
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Re: Dual 2.5" vs Single 3" exhaust
[Re: runinonmt]
#1223241
05/01/12 09:55 PM
05/01/12 09:55 PM
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Joined: Nov 2011
Posts: 2,154
Its a TRAP!
DARTH V8Я
OP
Oh No!! I just had a moron attack!
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OP
Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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I can't find that article... would you have a link?
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: Dual 2.5" vs Single 3" exhaust
[Re: DARTH V8Я]
#1223242
05/02/12 12:32 PM
05/02/12 12:32 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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another thing to think about. per unit length and gage of tubing, dual 2.5" will have 67% more material than single 3" while giving only 39% more cross sectional area. due to boundary layer effects with the greater surface area of the dual pipes, you won't see all 38% flow improvement, probably closer to 30%. so you'll be adding a fair amount of additional weight for not as much flow improvement.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Dual 2.5" vs Single 3" exhaust
[Re: DARTH V8Я]
#1223251
05/02/12 08:44 PM
05/02/12 08:44 PM
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Joined: Dec 2010
Posts: 12,375
SoCal
MuuMuu101
I got lucky at Woodward!
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I got lucky at Woodward!
Joined: Dec 2010
Posts: 12,375
SoCal
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Quote:
HotRodDave, thanks for the detailed explanation.. awesome
bboogieart, yup.. the plan has changed. I'm going with a 5.3L from a 2010 Chevy Silverado
So theres no way to run a pipe down the drivers side, the spare tire well is in the way, and to even run 2" pipe both down the pass side, up over the axle to the rear bumper w/ 2 mufflers under the floor pan there is just no way without it looking like a total hack job. I think a single 3" is the way to go for my application.
Simple fix... Why don't you run open headers through the hood? 
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Re: Dual 2.5" vs Single 3" exhaust
[Re: runinonmt]
#1223252
05/02/12 10:11 PM
05/02/12 10:11 PM
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Joined: Nov 2011
Posts: 2,154
Its a TRAP!
DARTH V8Я
OP
Oh No!! I just had a moron attack!
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OP
Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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runinonmt, many many thanks my friend!  I'm going to a semi supply store to buy a 3.5" elbow.. IF that fits over the axle, I'm good to go. Also I agree that the single exhaust for performance apps has to be looked into more.
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: Dual 2.5" vs Single 3" exhaust
[Re: DARTH V8Я]
#1223255
05/03/12 10:59 AM
05/03/12 10:59 AM
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Joined: Nov 2011
Posts: 2,154
Its a TRAP!
DARTH V8Я
OP
Oh No!! I just had a moron attack!
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OP
Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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Yeah a single exhaust can sound every bit as good as a dual imo. I was talking with a guy last night who owns a 1986 Iroc (350cid). He was telling me that originally he had dual 2" exhaust w/ cherry bomb mufflers on it for a few years. He then went a built a single 3.5" for it ( 3.5 y-pipe, 3.5 main pipe, flowmaster 40 series muffler 3.5 in/out) and told me that the car went 6/10ths faster in the quarter mile (from 13.60 to 13.00)! I had no idea a dual 2" with cherry bombs were THAT restrictive!
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: Dual 2.5" vs Single 3" exhaust
[Re: DARTH V8Я]
#1223256
05/03/12 01:13 PM
05/03/12 01:13 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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I patterned the system on my 5th avenue similar to the stealth bomber. I used "cheapie" summit 1 5/8" headers, to 3" 409 stainless collectors, then mandrel bent 409 stainless to a stainless magnaflow dual 3" in/3" out Y, a 3" stainless flex coupler to a dynomax 16669 3"in/out/internal "large body hemi" turbo muffler (10x5x22" case), 3" 409 mandrel bent over the axle, a 3" glass pack in the tailpipe (really helped with interior resonance/drone) to a gibson 3" turn down tip. sounded very nice...here's a clip I put on youtube before I sold it http://www.youtube.com/watch?v=QvZ2lqPzogQ
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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(they are 2 different sized holes)
