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Running exhaust under the axle

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Old Feb 23, 2009 | 12:42 PM
  #1  
86z28iroc-z's Avatar
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From: North Dakota
Car: 86' Z28 Camaro
Engine: 357 TPI -- Dart Heads -- Voodoo Cam
Transmission: Built 700r4
Axle/Gears: 3.23 Posi
Running exhaust under the axle

Doing a new exhaust setup and putting an electric exhaust cutout somewhere in the I-pipe and running a tailpipe off of it to have it exit on the passenger side out the back.

Was wondering if it were possible if I put the cutout in the red circle and ran the pipe under the axle in the black circle??

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Old Feb 23, 2009 | 05:36 PM
  #2  
Saber's Avatar
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From: Tampa/New Hampshire
Car: 91 camaro RS, 87 T/A
Engine: 350 TBI, 305 TPI
Transmission: 700r4
Axle/Gears: 4th Gen 3.42/BW 3.45
Re: Running exhaust under the axle

you would loose a ridiculous amount of ground clearance in doing that. Why dont you place the cutout further towards the engine and run your exhaust the normal stock route?
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Old Feb 23, 2009 | 05:47 PM
  #3  
1brd2brd3brd4's Avatar
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From: Evington,Va
Car: 93 Formula,88 T/A,01 WS6
Engine: 93 LT1,88TPI305,01 LS1
Transmission: 93 700R4,88 700R4,01 T56
Axle/Gears: 93 3:73's,88 3:42,01 3:40
Re: Running exhaust under the axle

Uh.........you know the rear axle moves up and down,dont you? Not only would you lose ground clearance......you would have to chain your axle to the bottom of the car so it wouldnt articulate down...........think about it........dont you think it would look a little bit ......uh......hacked up and crappy? Just buy the cut out, buy a turn down and just run the turn down
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Old Feb 23, 2009 | 06:16 PM
  #4  
tom86iroc's Avatar
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From: pawtucket RI
Car: 1986 iroc
Engine: alum. head 350 supercharged
Transmission: 6speed
Axle/Gears: ford 9in 3.90 35 spline moser axles
Re: Running exhaust under the axle

i've seen a couple cars just have the cut out right there for the track and use nothing else with it why would you want more pipe under there ?
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Old Feb 23, 2009 | 06:31 PM
  #5  
blg0720's Avatar
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From: Mebane, NC
Car: 88 GTA
Engine: 305 V8 LB9
Transmission: 4 sp. Auto-4L60
Axle/Gears: 3.27
Re: Running exhaust under the axle

Yep...you hit one good pothole and that nice new custom exhaust is toast.
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Old Feb 23, 2009 | 06:50 PM
  #6  
I H8 WWD's Avatar
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From: Cleveland, Ohio
Car: 89' IROC-Z
Engine: LO3
Transmission: 700R4
Axle/Gears: 10-Bolt/2.73
Re: Running exhaust under the axle

I have an idea.

Where the over axle pipe 90*'s into the muffler have a straight pipe off that connected to the outlet exhaust pipe for the right rear tip, this way flip the switch and it bypasses the muffler STILL, and would still exit out the right rear.

Fitment issues of course, but an idea no?
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Old Feb 23, 2009 | 09:22 PM
  #7  
86z28iroc-z's Avatar
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From: North Dakota
Car: 86' Z28 Camaro
Engine: 357 TPI -- Dart Heads -- Voodoo Cam
Transmission: Built 700r4
Axle/Gears: 3.23 Posi
Re: Running exhaust under the axle

Heh, I should posted my initial idea first.

I have to have the extra pipe off the cutout because it sounds like an old tractor without a longer tailpipe, plus the logner pipe is needed to place my higher exhaust throughput in the lower rpms where I make all of my power/tq, plus it reverberates so bad inside with anything that's not out the back even with turndowns.
Having the open pipe I have right now isn't very loud in the cabin at all, plus it has alot more tone than just open y or muffler cutoff. Plus then I can retain the dual exit look. I've got straight pipe through an offroad y-pipe with a muffler delete and single exit on the drivers side rigth now.

This was my initial idea.



But looking closer into it i'd have to have the exhaust hanger welded onto the cutout or pretty close to one side, thought that going under the axle would maybe work after seeing a post of a 4th gen on this site that had 2 pipes running under the axle one on each side, I can't find the link now.

EDIT!
Found the post, it was on ls1tech.

http://ls1tech.com/forums/generation...-pics-56k.html

duals going under the axle, and he said he didn't have any problem? Plus he is lowered, whereas I am stock height. The stock I-pipe that I have right now would be the same height as the pipe running out the back and that doesn't scrape? So no ground clearance would be lost, it would be the same.

Last edited by 86z28iroc-z; Feb 23, 2009 at 09:47 PM.
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Old Feb 26, 2009 | 01:12 PM
  #8  
86z28iroc-z's Avatar
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From: North Dakota
Car: 86' Z28 Camaro
Engine: 357 TPI -- Dart Heads -- Voodoo Cam
Transmission: Built 700r4
Axle/Gears: 3.23 Posi
Re: Running exhaust under the axle

No1 has a response to the how that guy ran his exhaust?
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Old Mar 28, 2009 | 01:52 PM
  #9  
RED_DRAGON_85's Avatar
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From: Norfolk VA
Car: 85 Camaro IROC
Engine: 5.7 TPI
Transmission: 700-R4
Axle/Gears: open rear, 3.42 gears
Re: Running exhaust under the axle

your pic you drew is pretty much exactly what the borla system is...
so that would work just fine.
i wouldnt do under the axle, even if a 4th gen did it just fine.
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