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Old 04-26-2013, 06:46 PM   #1
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Duel exaust

Anyone else out there have duel exhaust on there inlines? I just got a flowmaster 40 series muffler and duel exaust on my 2.5l 4 cylinder and it sounds pretty dang good for a 2.5l! Just curious if I'm the only one?

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Old 04-26-2013, 10:15 PM   #2
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I have a Pace Setter Header and a super 44 Series flow master and I love the way my 2.5 sounds. no dual exhaust though...

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Old 04-27-2013, 04:51 PM   #3
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Most guys just run a bigger single pipe, but it is all up to you. That is the great thing about having your own jeep.
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Old 01-24-2014, 12:33 AM   #4
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Anyone else out there have duel exhaust on there inlines? I just got a flowmaster 40 series muffler and duel exaust on my 2.5l 4 cylinder and it sounds pretty dang good for a 2.5l! Just curious if I'm the only one?

Would you mind sharing your layout/ design for it. I really want to do this with my 2.5l yj
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Old 01-24-2014, 12:54 AM   #5
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dual exhaust on a 2.5 ? That is 1.25 L per exhaust.
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Old 01-24-2014, 06:19 AM   #6
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Is it really dual exhaust or just dual pipes AFTER the muffler?
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Old 01-24-2014, 07:06 AM   #7
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This is what I did with mine. I have no rear track bar which made room for the exhaust.

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Old 01-24-2014, 01:28 PM   #8
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Is it really dual exhaust or just dual pipes AFTER the muffler?
It's just duels after the muffler but it sounds pretty good if say and so have many others
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Old 01-24-2014, 01:30 PM   #9
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Would you mind sharing your layout/ design for it. I really want to do this with my 2.5l yj
It's just a single pipe to the flowmaster with a duel output and duel pipes all the way to behind the wheels
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Old 01-24-2014, 01:34 PM   #10
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Here's a video clip of it running sounds better now after break in but you get the idea
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Old 01-24-2014, 01:56 PM   #11
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DUEL =2 guys have a fight with pistols

DUAL = 2 (pipes or whatever)
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Old 01-24-2014, 02:17 PM   #12
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DUEL =2 guys have a fight with pistols

DUAL = 2 (pipes or whatever)
in this case maybe it was cap pistols
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Old 01-24-2014, 02:24 PM   #13
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in this case maybe it was cap pistols
Hey wait a minute I own one of those cap pistols
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Old 01-24-2014, 03:37 PM   #14
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Does anyone make a true duals manifold for the six?
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Old 01-24-2014, 03:41 PM   #15
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Does anyone make a true duals manifold for the six?
it's been several years but I had a 6 cylinder jeep with split headers..I want to say they were offenhauser but it's been a long time
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Old 01-24-2014, 04:05 PM   #16
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Does anyone make a true duals manifold for the six?
There was a company called Clifford Research that did a lot with 6 cyl motors. IdK if they are still around tho.
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Old 01-24-2014, 05:02 PM   #17
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Hey wait a minute I own one of those cap pistols
being an old wrench,I am surprised that you have not hotrodded it yet
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Old 01-24-2014, 05:28 PM   #18
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being an old wrench,I am surprised that you have not hotrodded it yet
I am just looking for the right deal for a donor to transplant.Ive spent the last 6 month just fixing what was broke.Leaning towards a 4.3.
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Old 01-24-2014, 05:47 PM   #19
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I just saw a donor that you could build a monster out of..84 chevy 1 ton..454,400 turbo,205 t-case,dana 60 front,14 bolt rear...navy base fire dept. truck..45,000 original miles $3500
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Old 01-24-2014, 05:56 PM   #20
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DUEL =2 guys have a fight with pistols

DUAL = 2 (pipes or whatever)
I was thinkign about posting this:

In order for your exhaust to duel, you would need dual exhaust, they could duel and duel until one wins, then one would die, and you would end up with single exhaust and all would be good....
Dual exhaust will also fail an emissions test, not only do you need single exhaust as Jeep designed, but duel exhaust would make it tough for the inspector to inspect, he might be hit with a wayward muffler from your dual exhaust during the duel...
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Old 01-25-2014, 02:02 AM   #21
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Does anyone make a true duals manifold for the six?
I actually have a set of them in my garage
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Old 01-25-2014, 02:06 AM   #22
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I was thinkign about posting this: In order for your exhaust to duel, you would need dual exhaust, they could duel and duel until one wins, then one would die, and you would end up with single exhaust and all would be good.... Dual exhaust will also fail an emissions test, not only do you need single exhaust as Jeep designed, but duel exhaust would make it tough for the inspector to inspect, he might be hit with a wayward muffler from your dual exhaust during the duel...
My bad guys dual exhaust haha Except if it were to backfire then it may sound like an exhaust duel haha but here in Michigan we don't have inspections so I don't have to worry about that
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Old 01-25-2014, 06:31 AM   #23
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I was thinkign about posting this:

In order for your exhaust to duel, you would need dual exhaust, they could duel and duel until one wins, then one would die, and you would end up with single exhaust and all would be good....
Dual exhaust will also fail an emissions test, not only do you need single exhaust as Jeep designed, but duel exhaust would make it tough for the inspector to inspect, he might be hit with a wayward muffler from your dual exhaust during the duel...
Actually emission stations have an adapter that slips over the end of the probe with 2 tubes on it . It is meant for cars with factory DUALS,it gets an equal sample from both sides. We use to have emission testing in Florida and I have seen it used a lot.
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Old 01-25-2014, 12:17 PM   #24
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Actually emission stations have an adapter that slips over the end of the probe with 2 tubes on it . It is meant for cars with factory DUALS,it gets an equal sample from both sides. We use to have emission testing in Florida and I have seen it used a lot.
I know this, but the Jeep YJ NEVER came from JEEP with dual exhaust, so it is an illegal modification...

I use it about once a week for those older vehicles that are still around that came from the factory with dual exhaust.
The one we use in Cali has a tap near the probe that allows the attachment of a second hose and tip for the second exhaust exit.
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Old 01-25-2014, 01:15 PM   #25
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Does anyone make a true duals manifold for the six?
I looked in your profile to find that you have a 92, so I assume you have a 4.0. Early 2000's models had a dual output manifold, and some companies make headers for these models. I would think you could use one of those on your engine, the only hitch I can think of would be I don't know what you would do about your single O2 sensor.
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Old 01-25-2014, 07:52 PM   #26
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I know this, but the Jeep YJ NEVER came from JEEP with dual exhaust, so it is an illegal modification...

I use it about once a week for those older vehicles that are still around that came from the factory with dual exhaust.
The one we use in Cali has a tap near the probe that allows the attachment of a second hose and tip for the second exhaust exit.
Sorry I didnt realize you lived in the part of the U.S. that is under communist control.I dont see how they could give you greif over a muffler with two tailpipes coming out of it.A lot of cars come from the factory that way.
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Old 01-25-2014, 09:49 PM   #27
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There was a company called Clifford Research that did a lot with 6 cyl motors. IdK if they are still around tho.

They where still kicking a year ago when I bought a 4Bl. intake to go on my 4.0 head for my stroker motor.
There motto is 6=8
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Old 01-25-2014, 10:53 PM   #28
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Sorry I didnt realize you lived in the part of the U.S. that is under communist control.I dont see how they could give you greif over a muffler with two tailpipes coming out of it.A lot of cars come from the factory that way.
2 tailpipes? thats ok, true dual exhaust, no.
to install true duals, thats 2 full exhaust systems.
Dual tailpipes doesnt matter, anyone can get a 1 in 2 out muffler and pipe it however they want.
Cali/Federal just wants everything AT and BEFORE the cat to be stock, or an approved aftermarket part.

Database: Aftermarket Parts Database of Executive Orders

Cali pretty much writes the rules as far as Federal approved stuff, most states follow Cali aftermarket parts exemptions.
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Old 01-26-2014, 09:13 AM   #29
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I looked in your profile to find that you have a 92, so I assume you have a 4.0. Early 2000's models had a dual output manifold, and some companies make headers for these models. I would think you could use one of those on your engine, the only hitch I can think of would be I don't know what you would do about your single O2 sensor.
Yep it's a '92 4.0. Sorry for not mentioning that!

I'm going to look for the dual output manifold. I'll have to figure out the sensor (no smog testing or inspection in Michigan thank God!). I'll look at a custom bent exhaust with minimal mufflerage lol. I want real duals.

Some of the new cars crack me up. An econobox where you can actually see the two pipes coming out of the single muffler is ridiculous. Not sure what they're trying to prove.
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Old 01-26-2014, 10:19 AM   #30
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I would think there would be some way to get around the O2 thing. It's possible you might even be able to just run it on one side and plug the other, since it measures the A/F ratio, not the volume of burnt fuel particles.

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