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Unread 07-19-2005, 06:10 PM   #1
Ned97sahara
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dual exhaust on a 4.0L

Has anyone done this and if so how did it turn out?

Oh yea I have a WJ.

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Last edited by Ned97sahara; 07-19-2005 at 07:10 PM..
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Unread 07-19-2005, 06:40 PM   #2
zaq123
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Quote:
Originally Posted by Ned97sahara
Has anyone done this and if so how did it turn out?
I don't know about dual but triple is pretty cool
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Unread 07-19-2005, 07:04 PM   #3
ChicagoGuy
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I assume for this is more for looks? On a WJ or a ZJ.

On a ZJ, this is going to be a pain to fabricate - there isn't a lot of room. I'll look at mine when I get home again to be sure, but I just don't see where you'd run the pipe...maybe put in a Y after the muffler or something.

But it has been done. Flowmaster makes a dual outlet muffler you could also use, but again, you have a big ol' gas tank and an axle getting in the way.

If it's just for looks, just run a pipe up into the nether regions on the drivers side and be done with it.

On a WJ, I have no idea.
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Unread 07-19-2005, 09:53 PM   #4
cajunmudder
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Why? if there only one exhaust manifold making a bend for a second pipe is just more restrictive.
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Unread 07-19-2005, 09:59 PM   #5
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Plus, it'd be twice as much crap to tear off if you ever take your Jeep offroad. If you are looking for less backpressure, maybe go with a bigger diameter pipe.
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Unread 07-19-2005, 10:26 PM   #6
ChicagoGuy
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Using my amazing ASCII art skills, let me try and illustrate why this isn't common for an inline engine.

On a V engine, you have two sets of headers:

/ \
/ \ <---- Headers
/ \
/ \
| |
| |
[] [] <----Mufflers
| | <----Dual exhaust tips

So in this case, each cylinder bank can benefit from a less restrictive exhaust path.

But on an inline engine, you only have the one header outlet

\\\/// <----Headers
|
|
[] <----Muffler
| <----Tail pipe

So there isn't really any benefit (or place) to add another run, nor does it help the engine. Like Cajun said, bends are bad.

But it has been done on a WJ - quick search turned up this (but it's a V8):

http://www.jeepforum.com/forum/showt...t=dual+exhaust

Seriously though, if it's just a cosmetic thing, and you gotta have it, just add a tip. Don't run unneeded pipes for no reason.
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Unread 07-19-2005, 10:29 PM   #7
ChicagoGuy
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Ok, so not so amazing ASCII art skills...it looked WAAAAY different in the edit pane before I posted it and it removed all my precision spacing...

Just envision two lines in the top description, one line on the bottom description and you'll understand.
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Unread 07-19-2005, 10:35 PM   #8
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i have duals on my 94 jgcl 5.2 there is really not much room to squeeze it in there. i was told not to put alot of weight in the back cuz pipe will hit axle. but all in all in sounds and looks great. i had them custom made too, not a kit from pacesetter. cost me around $300 to make
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Unread 07-20-2005, 10:39 AM   #9
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dual exhausts on an inline engine?

bwahaha.
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Unread 07-20-2005, 12:20 PM   #10
doyll
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Quote:
Originally Posted by gregmondro
dual exhausts on an inline engine?

bwahaha.
dual exhaust on a V engine bwahaha

Same - same.
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Unread 07-21-2005, 10:34 AM   #11
gregmondro
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Quote:
Originally Posted by doyll
dual exhaust on a V engine bwahaha

Same - same.
Dual exhaust on V engines has it's benefits...
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Unread 07-21-2005, 11:26 AM   #12
ChicagoGuy
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Quote:
Originally Posted by gregmondro
Dual exhaust on V engines has it's benefits...


Did my random set of lines above teach nothing?
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Unread 07-21-2005, 12:09 PM   #13
cfb3001
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it apears not vette, currently I'm running a sorta dual setup on my zj, its all one pipe from the manafold back to where the cat should be, right there I put a flowmaster 40 series, dual outlet, then took the 2 pipes that came outta that back to just in front of the rear tire and took them both out the side, dosent look too back and maney people mistook it for the V8 so I'm impressed, I'd get a pic up but there was an incident of me throwing a rather large rock up w/ the front tire and dinking my front pipe really good so thats a no go on that
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Unread 07-21-2005, 12:50 PM   #14
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My cousin had a custom dual exhaust made for his 94 v8 and it kept burning holes in the fuel line, and that was from a reputable muffler shop. After 3 tries, they finally settled with a single pipe. Just something to keep in mind.
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Unread 07-21-2005, 01:15 PM   #15
doyll
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Best exhaust is a fully tuned set of pipes.. doesn't matter if its a I2, V2, I6, V6 I5, V8 V10. The truth be told, a V8 with a set of tuned headers that all connect into one collector is much better then dual exhaust. Tuned headers uses the collecter and tube length to tune the exhaust pulses to help purge cylinders. Previously fired cylinders' exhaust pulse sucks next ones exhaust out as valves open and close. If you listen to a V8 with dual exhaust, you will hear a pause betweens sets of cylinder firings'. This is why it isn't a perfect 'tuned' exhaust. The firing order moves from one bank to other. 1-8-4-3-6-5-7-2 left bank is 1,3,5,&7, right bank is 2,4,6,&8, so left bank is firing 1,-,-3,-,-5,7 right bank is firing -,8,4,-,6, -,-,2.. Ther is no consistant rythem here A V8's 4 cylinder per side header is not as tuned a set as using all 8 cylinders. The problem is that there isn't room to run all 8 header pipes into one collector in most applications,.


Dual exhaust does sound cool though
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