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Old Apr 28, 2006 | 11:00 PM
  #1  
Iroc Adio's Avatar
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From: New Bedford, Ma
Car: 1987 IROC
Engine: Destroked 377
Transmission: TH-400
Axle/Gears: 9inch with 3.70's
Dual or Single

Im having my new engine built as i speak. Its a 383 with about 490hp and 440tq. Im wondering if i should go with dual exhaust or single. I have hooker 2210 LT's, for the dual setup i want to run 3" piping back into 2 Flowmaster Delta Force Race mufflers with turndowns. Or run the mufflex y pipe with the Mufflex 4" flowmaster catback single outlet. Has anyone ran into this decision before? What would you go with?
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Old Apr 29, 2006 | 04:35 PM
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1989GTATransAm's Avatar
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
One of our club members is running a 400. He went with the Mufflex 4" system. A couple of us have gone with the Mufflex 3.5" system but we are running 355's.
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Old Apr 29, 2006 | 04:58 PM
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From: Menominee MI
i personally would go w/ dual 3in with that motor

but if u deside on a mufflex. get the magnaflow or spintech muffler...they flow alot better, and sound alot better...
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Old Apr 29, 2006 | 05:14 PM
  #4  
Iroc Adio's Avatar
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From: New Bedford, Ma
Car: 1987 IROC
Engine: Destroked 377
Transmission: TH-400
Axle/Gears: 9inch with 3.70's
I'd rather go with the dual 3" just because of the cost. I could build duals for about $250. I think for the mufflex y pipe alone is $275 then the catback for $575. Thats real expensive. The only thing that sucks about duals is the ground clearance.
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Old Apr 29, 2006 | 06:11 PM
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From: Menominee MI
yea the y pipe alone is 275, then its over 600 for the catback i'm pretty sure...you'll have some bucks tied up real quick into your exhaust....

i have true duals with an h pipe, and my ground clearance is excellent...i can't get it to bottom out now and my car is lowered 2 inches...i have dual 2.5's tho too...but if oyu take your time fabbing it up, and tuck it up real nice, you should be able to achieve some real good ground clearance..
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Old Apr 29, 2006 | 07:19 PM
  #6  
Iroc Adio's Avatar
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From: New Bedford, Ma
Car: 1987 IROC
Engine: Destroked 377
Transmission: TH-400
Axle/Gears: 9inch with 3.70's
KLUMB15 could you show me some pics of how you did it?
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Old Apr 30, 2006 | 02:22 AM
  #7  
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From: Menominee MI
click on VISIT MY HOMEPAGE when you click on my screen name, it'll take you to my cardomain page, the exhaust pics are on the last page i believe, if not they are in there somewhere...
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Old Apr 30, 2006 | 09:31 AM
  #8  
1FastZ's Avatar
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Joined: Jul 2001
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From: Louisville Kentucky U.S.A.
Car: 86 Iroc Z
Engine: 406
Transmission: 350 Turbo
Axle/Gears: 373
actually they are on page 6
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Old Apr 30, 2006 | 06:22 PM
  #9  
grover85's Avatar
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
why not build your own single four inch. Thats what I did. I have shorty headers, a true 3 inch y pipe into a four inch pipe, two mufflers, and dual tips. I had about 200 bucks in pipe and 180 bucks into a dual out spin tech muffler.
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