cherokee dual exhaust??? thoughts?

[homey_15]

"I noticed a BIG increase (if you can say that about my engine) when I went to my new exhaust. It was a Gibson Grand Cherokee exhaust, I had new pipe bent for it and the shop just removed my cat since it was so banged up and shot. It's 2" pipe. I would stay away from dual. It just doesn't look right on a cherokee. Kinda poserish."

i'm torn on what to do here guys, i know people that run exhaust so i can get it done semi-cheap. i can see how you could make it look really gay if you're not careful but if i did it, i'd run true dual 2" all the way back and then make it exit just like it did from the factory, only on both sides. thoughts? would it look like crap or be ok? i think that unless you knew what you are talkin about you'd never notice it but thats why i'm making this post, seeing what everyone else's opinion on the subject is. thanks again guys.

[Scott Mac.]

The only XJ I've seen with dual exhaust had a problem with a melted fuel line 300 miles from home.

[homey_15]

didnt think about that, thatd be a bad deal. i'll crawl under there later and see if theres enough room to even think about it. i just assumed there was, perhaps i was wrong.

[crimsonride]

Seems to me like it was kinda tight beside the T-case and frame rail.

[homey_15]

this idea has officially been nixed as i'm pretty sure itd cause my cherokee to go sky high.......looks like i'll be doing more checking into a bigger single setup......

[LT1XJ]

It all depends, do you want true duals or something like a large single pipe to the muffler and then two out. I think it would be tough to run true duals on an XJ because of clearance, but it could be done but would most likely involve running both pipes down the passenger side. On my LT1 I run a single 3" to the muffler and then it splits into two coming out of the muffler. It is tight getting it all around the gas tank and springs, but it works. And personally I don't see any problem with the looks of duals on an XJ. I personally think some 3" chrome tips would look a little goofy not to mention a lack of clearance for them. I use some small borla tips. Here is a bad pic, I know the drivers side is lower, it is because the bolt came out of the hanger, but it is fixed.
http://photos.yahoo.com/bc/lt1xj/vwp?.dir=/Jeep+Pictures&.dnm=Rear%2bXJ.jpg&.src=ph&.view=t&.hires=t

[Slip Kid]

I wouldn't split it, that's fake. Do you have the v6? you could probably do true duals on that... It would be really hard with a 4.0. I looked into it, since my PS header has two outlets. It would take a lot of intricate bending. It's possible, but I decided to wait on that project. A strait 6 kinda should have a single pipe anyway. sounds like a datsun :D

[5-90]

It's possible to split I6 exhaust - some headers are dual/triple and can run two parallel pipes to the rear with either tube resonators or a double-input muffler...

I remember seeing this run over the board here recently, and no-one answered the most pertinent question - why? Given the way an inline six breathes, if you are running more air into it, go to either a 2.75" or (biggest!) 3" pipe and high-flow catalytic converter and exhaust.

A well-made header is setup to take the exhaust pulses and use the slight vacuum between them to enhance sxhaust gas scavenging, and you will likley lose that if you split the exhaust. I'd keep the six-into-one arrangement, and just go with a little bigger pipe (but definitely, no bigger than 3.00"!)

5-90

[Slip Kid]

The pacesetter header has half the cylenders on one collector and half on the other. I'd be easy to run out the sides, but as for a legal true dual setup, that's what I don';t know about

[Ghost]

The only true way to do dual pipes is with a v-8 swap! LOL!

[xjmike]

I'v seen dual's on a cherokee...sounded like a rice burner...and yes it was a 4.0L........also no need for a dual's on a 4.0L as the horse power is no where near the need for dual's...you would also lose alot of low and mid range power to gain a very minumum top end...jusy my 2 cents

[homey_15]

i actually have a v6, i see no need for duals on something that doesnt have more than one exhaust manifold

[LT1XJ]

Iagree, a six is not the best candidate for duals. On my LT1, I would have run duals all the way back, there just wasn't room so I went with a large pipe to the muffler and then splitting into two smaller ones. I was just saying looks wise duals look pretty good coming out the back. But if it sounded like a bumble bee then it might be different.

[notorious DUG]

More pipes are just more things to get hit and torn off under a Jeep.

On a low RPM high torque aplication you are just not going ot get the kind of gains to make it worth the cost and effort IMO

[CheapXJ]

My old 2.8 sounded pretty damn mean when I had to go get new bolts for the downpipe and had ALL the exhaust off from the collectors back (open manifolds?)

2.8s are shitty engines, but runnin duals, and flowmaster 40s they sound MEAN as all hell.

[crimsonride]

Yup. I was kinda surprised when I got my new exhaust. It's fooling.

[bill hitchcock]

split exhaust is a waste of time on a inline 6. even the guys running the strokers keep the 2.25 pipe for adequate backpressure. spend the money on a cam shaft and gear. if you want any real horsepower gain.

[crimsonride]

Originally posted by bill hitchcock
split exhaust is a waste of time on a inline 6. even the guys running the strokers keep the 2.25 pipe for adequate backpressure. spend the money on a cam shaft and gear. if you want any real horsepower gain.
He doesn't have a inline. It's a V, read the thread.

[THE_OWL]

I run true dual exhaust with headers, two mufflers and side exhaust. with a Chevy V8. it is a really tight fit.my front DS has been known to rub it from time to time.
I dont see any reason to run a dual exhaust on a 4.0 Actually, (not that its a big deal) adding dual exhaust will add uneeded weight if anything
\\hoot

[crimsonride]

Originally posted by THE_OWL
I dont see any reason to run a dual exhaust on a 4.0 Actually, (not that its a big deal) adding dual exhaust will add uneeded weight if anything
\\hoot


COMMON PEOPLE. HE DOESN'T HAVE A 4.0. IT'S A V6!!!!!!!!!!!!!!!!!!!!

does anyone actually read these threads?

[THE_OWL]

Maybe you should read a little. Users have been talking about everything from V8, V6s and 4.0s.
Cherokees in general

[notorious DUG]

Originally posted by THE_OWL
.my front DS has been known to rub it from time to time.
]

I had that problem. I had a head pipe made that wraps around the front of the oil pan and then connects to the other one, works great and everything os out of harms way.

[crimsonride]

Originally posted by THE_OWL
Maybe you should read a little. Users have been talking about everything from V8, V6s and 4.0s.
Cherokees in general

The subject of the thread is to give Homey advice. He's the one who posted it. So please help reduce hijacking by keeping the thread where it belongs. And that is to give advice to the person who origionally posted the thread. If you want a discussion on dual exhaust then start a new thread on it instead of hijacking someone elses.
Common, this is a common rule among forums.

[notorious DUG]

Originally posted by crimsonride
The subject of the thread is to give Homey advice. He's the one who posted it. So please help reduce hijacking by keeping the thread where it belongs. And that is to give advice to the person who origionally posted the thread. If you want a discussion on dual exhaust then start a new thread on it instead of hijacking someone elses.
Common, this is a common rule among forums.


In a sense are you not hijacking this thread to make a rant on internet etiquette?

The subject is duals on a XJ, not duals on only 2.8L XJs. They are all mostly on topic...well except for your post and this one.

I bet with some coal and a little effort you could make diamonds up there.....

[homey_15]

i've got enough on bottom, its top end i'm looking to gain, which is why i was looking into running a bigger, more free flowing exhaust.

[notorious DUG]

Originally posted by homey_15
i've got enough on bottom, its top end i'm looking to gain, which is why i was looking into running a bigger, more free flowing exhaust.

Welcome to trade off land. Big open exhaust hurts low end grunt.

[crimsonride]

Originally posted by notorious DUG
In a sense are you not hijacking this thread to make a rant on internet etiquette?

The subject is duals on a XJ, not duals on only 2.8L XJs. They are all mostly on topic...well except for your post and this one.

I bet with some coal and a little effort you could make diamonds up there.....

So how does discussing wether or not a I6 sounds good with dual exhaust help him decide what he want's on his V6? In the first post he states what he wants. You stick to that or you don't help him. Get your own post. If you post doesn't address his need then it's off track and his thread is null, he won't get what he needs.

[homey_15]

actually when i made the post, the point of this post was to see what everyone thought about putting duals on my 2.8, not only how it would look exiting the vehicle but if it would net me any gain in top end

[notorious DUG]

Yeah but the SUBJECT line and the origional post both say NOTHING specific about the engine.

Plus the average user or people preforming searches in the future may find the info helpfull. The origional poster may find the other info usefull as well, even if it is not specific to his vehicle.


Tell me, is it hard going through life so concerend with others?

[crimsonride]

Originally posted by notorious DUG
Yeah but the SUBJECT line and the origional post both say NOTHING specific about the engine.

Plus the average user or people preforming searches in the future may find the info helpfull. The origional poster may find the other info usefull as well, even if it is not specific to his vehicle.


Tell me, is it hard going through life so concerend with others?

I'm just trying to help Homey get what he needs. Sorry I'm not in for the "greater good of the community".

Tell me. Do you always end your posts with insults.

[notorious DUG]

Originally posted by homey_15
actually when i made the post, the point of this post was to see what everyone thought about putting duals on my 2.8, not only how it would look exiting the vehicle but if it would net me any gain in top end

Nopmatter what the engine larger, more open echaust will improve top end power unless you get to the point where you are over scavanging the cylinders and I doubt most XJ motors even have to worry about it.

Of course like I said before their is a trade off, you will loose some of the low enbd power but you may see better throttle response.

[homey_15]

well i guess i should apologise for not being perfect here notorious, its all my fault. if we would spend less time being synical and more time trying to get along and help each other out, then maybe when it was made clear later on in the post that we were talking about my 2.8 cherokee everyone could have took that into consideration before getting entirely off the subject and putting others down.

[homey_15]

see we coulda skipped the part in the middle where we were doing nothing but being a pain in each others asses and jumped right to the part where we give the valuable info and opinion that we have on the subject. thanks for your help.

[crimsonride]

I think we're back on track. Lets just stick to what's on hand.

Homey, you know my opinion. I think dual is more for looks than for performance. You should get more than enough flow with 2.5 pipe than you need. I had a slight poping after I let the gas of when I reved it. That's because there's not enough backpressure. It went away after a couple days though.

[homey_15]

actually, thats what i've been leaning towards. doing 2" to a intersection where it becomes like 2.5 or 3 or so, and stays that size all the way back. i think this mod will really make its usefullness known when i get the "hipo" cam in and i'm flowing even more air.

[crimsonride]

That would be a good idea. Especially if you plan to swap in that 5.0.

[homey_15]

i didnt really think about that, i'd be able to use everything from where it steps up in size all the way back if i were to use 3". just have to have new downtubes made. good point

[MaXJohnson]

Originally posted by crimsonride
I had a slight poping after I let the gas of when I reved it. That's because there's not enough backpressure. It went away after a couple days though.

Does this mean your backpressure increased after a couple of days? How would this lack of "backpressure" cause popping?

Back to the original 2.8;
headers, head work, larger intake ...
A 2.8 isn't a very big pump. Where is all this exhaust coming from?

[homey_15]

its not that i'm going to NEED 3" exhaust to keep up with the air that my 2.8 is going to move its that while i'm doing it, why not go overboard?? i try to stick to the addage that " too much is just enough"

[bill hitchcock]

i mis-typed i ment to say v 6. the info is the same. give me a break

[bill hitchcock]

ok i need to stop replying on post after i get home from the bar..... my opinon on dual exhaust would be no. im going to shut my dumb drunk ass up now....

[homey_15]

hahahahah understood, and after hearing some problems others have ran into, i'd have to agree that duals would be bad, i think i'm going to go with a big single setup.

[bill hitchcock]

when you do make sure your rear leaf springs dont rub on the new larger pipe. ive done it before and the noise gets really really anyoying on the highway.

[xjmike]

can't we all just get along .......bottom line dual's on a cherokee...no unless you have a v8........

[notorious DUG]

Originally posted by homey_15
its not that i'm going to NEED 3" exhaust to keep up with the air that my 2.8 is going to move its that while i'm doing it, why not go overboard?? i try to stick to the addage that " too much is just enough"

To much is just enough does not apply to exhaust!

To much will leave you with a twitchy monster with no power down low , big mid range and over scavenged cylinders at high RPM.

So, please explain what changed in the exhaust that made the popping go away? Infact explain how the popping had naything to do with the exhaust and was not a product of incorrect fuel metering or timing.

[homey_15]

i dont think i'll have scavanging problems running my stock exhause manifolds as they suck. i'm sure if i had a good set of aftermarket headers this would be a problem but i dont think it will in this case. as i said before, i know i'll give up a little bottom end to get more top but i've got plenty on bottom and am willing to make the sacrafice.

[Flexyxj1]

I have a 92 Cherokee with dual exhaust on mine.It runs fine and sounds tuff.