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dual 3" into single 3.5"

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Old Jan 9, 2010 | 08:26 PM
  #1  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
dual 3" into single 3.5"

this is an update to my earlier thread to give some of you guys some ideas on an exhaust system. i decided to go dual 3" into a single 3.5". this system stops at the rear axle for now. i used all "off the shelf parts". the parts used are hedman 1 5/8" long tubes pn 68460, hedman header extensions qty(4) pn 18701, flowmaster y pn y300350, and qty(2) 3"x3" id connectors from autozone. you'll need hangers, and clamps if you're not welding it. i will try to upload some pics of the system on the car soon. thanks for looking guys...
Attached Thumbnails dual 3" into single 3.5"-my-camaro-exhaust-001.jpg   dual 3" into single 3.5"-my-camaro-exhaust-002.jpg  

Last edited by skirkland1980; Feb 20, 2010 at 02:03 AM.
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Old Jan 9, 2010 | 08:42 PM
  #2  
sailtexas186548's Avatar
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From: Kemah, Tx
Car: 1991 z28
Engine: Turbo 310
Transmission: T56
Axle/Gears: D44
Re: dual 3" into single 3.5"

looks great! post up some installed pics when you can
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Old Jan 9, 2010 | 09:24 PM
  #3  
1989GTATransAm's Avatar
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: dual 3" into single 3.5"

That is what I'm currently running only with 3" catalytic converters thrown in the mix. Routing all on the passenger side.
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Old Jan 9, 2010 | 09:35 PM
  #4  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

are you running long tube headers? do you have pics?
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Old Jan 10, 2010 | 04:18 PM
  #5  
1989GTATransAm's Avatar
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: dual 3" into single 3.5"

No pictures and custom Dyno Don short/mid length headers.
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Old Jan 10, 2010 | 05:08 PM
  #6  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

thats cool. i got really screwed when i took my other camaro to a muffler shop when they built my exhaust system. when they made the y pipe they just burned a small half dollar size hole where they t'd in the right side pipe.(caused a lot of restriction) well, it did ok until i built a new, more powerful engine. i went from running 9.3 1/8 mile to 10.5 1/8 mile. when i removed to system completely it ran a 8.17.
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Old Jan 10, 2010 | 10:22 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
Re: dual 3" into single 3.5"

"they just burned a small half dollar size hole"

That will cost a lot of horsepower. A good wye is worth some ponies.
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Old Jan 12, 2010 | 01:00 AM
  #8  
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From: Winnipeg, Manitoba. Canada
Car: 1989 T-Top GTA
Engine: 5.7L TPI> 6.2L
Transmission: 700R-4
Axle/Gears: 3.27
Re: dual 3" into single 3.5"

I'm planning kinda the same thing, but I'm gonna go 3" homemade Y-pipe into a 3" Single Flowmaster Cat-back system I'm already running. The crush bend system that the exhaust shop built sucks a**........... (search for yourself)

I've bought a tranny cross member that I'll clearance somewhat for the y-pipe to run underneath....

Please post pics as you go I'm very interested!!!!

Last edited by GTA Sammy; Feb 22, 2010 at 11:43 PM.
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Old Feb 21, 2010 | 06:06 PM
  #9  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

i just installed the moroso spiral muffler pn 94052 ($52) and i thought i would voice my opinion about it. i absolutely love it! it is very compact, and sounds amazing. its fairly quiet which makes it great for a daily driver and because my system stops at the rear axle. it also gave me just enough back pressure (compared to open pipes) to help my torque. it feels stronger from a stop.
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Old Feb 22, 2010 | 12:47 PM
  #10  
ziggy89's Avatar
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From: Muscatine IA
Car: 91 Firebird Formula
Engine: 383
Transmission: built 700r4
Axle/Gears: 4.11, 9inch
Re: dual 3" into single 3.5"

im thinkin bout doin this with the tax return. lets see how it turns out
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Old Feb 22, 2010 | 03:36 PM
  #11  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

cool. all those pipes and y are available in smaller sizes also. and any short small diameter muffler will work, like the flowmaster outlaw or a glasspack.
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Old Mar 15, 2010 | 12:24 AM
  #12  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

i finally posted a video clip for how the car sounds. let me know what you think. http://www.youtube.com/watch?v=wZNeOkRqse0
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Old May 29, 2010 | 04:43 PM
  #13  
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From: Leicester,Ma.
Car: 1988 TA
Engine: TPI 350
Transmission: auto
Axle/Gears: 3.27's
Re: dual 3" into single 3.5"

How is clearance with this on there?
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Old Jun 4, 2010 | 04:19 PM
  #14  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

the only clearance problem i had was around the torque arm, so i just dented the pipe a little. but now i made my own torque arm and have about 3" of clearance there. if you use 2" or 2.5" pipe there may not be a clearance issue.
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Old Jun 4, 2010 | 08:20 PM
  #15  
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From: Leicester,Ma.
Car: 1988 TA
Engine: TPI 350
Transmission: auto
Axle/Gears: 3.27's
Re: dual 3" into single 3.5"

i am going to use a 3inch tho...looks like you welded flanges on?
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Old Jun 4, 2010 | 08:26 PM
  #16  
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From: Leicester,Ma.
Car: 1988 TA
Engine: TPI 350
Transmission: auto
Axle/Gears: 3.27's
Re: dual 3" into single 3.5"

If you get a chance take a picture please with it on the car im very interested in doing this for mine it looks great
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Old Jun 8, 2010 | 10:01 PM
  #17  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

thanks. sorry its taking so long between posts, I'm starting a new job and been busy.
Attached Thumbnails dual 3" into single 3.5"-pict0007-2-.jpg   dual 3" into single 3.5"-pict0009-2-.jpg   dual 3" into single 3.5"-pict0008-2-.jpg  
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Old Jun 8, 2010 | 10:15 PM
  #18  
skirkland1980's Avatar
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

i sold the system to another member. here are some pics of it on his car.
Attached Thumbnails dual 3" into single 3.5"-exhaust-2.jpg   dual 3" into single 3.5"-exhaust-installed.jpg  
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Old Jun 11, 2010 | 11:46 PM
  #19  
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From: Florissant, (STL) MO
Car: 1985 Camaro Z28
Engine: LT1
Transmission: 4L60e/SS3600
Axle/Gears: S60/4.30/Spool
Re: dual 3" into single 3.5"

Looks good. I will be building something like this soon. My plan involves relocating the "frame rails" and rebuilding the trans crossmember so I can run 3" next to the trans and over the crossmember. Should free up some ground clearance I am loosing to my 2.5" x-pipe set up.
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Old Jun 17, 2010 | 11:53 AM
  #20  
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From: Leicester,Ma.
Car: 1988 TA
Engine: TPI 350
Transmission: auto
Axle/Gears: 3.27's
Re: dual 3" into single 3.5"

hmm it looks good..only problem im thinking im gonna have is it scraping because my car is lowered about 2 inches im assuming you had the car at stock ride height?
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Old Jun 17, 2010 | 07:53 PM
  #21  
skirkland1980's Avatar
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Posts: 1,354
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From: morrow, ga
Car: 82 S10, 83 280ZX, 84 Z28
Engine: 355 smallblocks..na, 2.8 turbo
Transmission: 85:th350, 84:700R4
Axle/Gears: 85:ford9 4.85, 84:stock 3.24
Re: dual 3" into single 3.5"

yes, using longtubes are a problem on lowered cars unless you want to seriously mod the underside of the car. since the pipe is 3" i lost 3" of ground clearance.
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Old Jun 17, 2010 | 08:40 PM
  #22  
9014josh's Avatar
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From: Leicester,Ma.
Car: 1988 TA
Engine: TPI 350
Transmission: auto
Axle/Gears: 3.27's
Re: dual 3" into single 3.5"

this could be interesting..i suppose i could always raise the car back up if i need to i ordered the stuff from jegs today to make a 2.5 version of your y pipe hopefully the half inch will help my clearance a little.
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Old Jun 25, 2010 | 12:12 AM
  #23  
PT3BOOMER's Avatar
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Posts: 69
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From: NORFOLK VA
Car: 84 Z28 / 99 S-10 ZR2 4X4
Engine: STOCK CARB'D 305 WITH 350 HEADS
Transmission: 700R4
Axle/Gears: STOCK
Re: dual 3" into single 3.5"

Hey guys!!! I'm the one Shane sold those 3in pipes to and I haven't had a problem so far. Clearance has been fine, but I am running larger tires so that could make a difference. I would like to know if using thermal wraps on the headers would make a difference in temp under the hood though.
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