all muffler and exhaust questions go here!!!!!!
07-16-2018, 01:30 PM
#4906
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Location: Minnesota
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Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
Im looking to up grade my exhaust. Possibly do a cat back set up. I hear the FM 40's work well with the XJ, but what is a decent high flow cat that wont break the bank. What/Where is a good place to shop for exhaust?
Last edited by Jeepers Creepers 07; 07-16-2018 at 03:01 PM.
07-17-2018, 03:55 AM
#4907
Hey so I'm pretty well knowing when it comes to exhaust questions. So instead of making a new thread for your question post it here and I or someother people will answer it for you...or pm me if u need a question answered right now like an emergency. Other then that I'm mostly on everyday. So post up some questions. From what to look for in a new muffler. Or to troubleshooting questions. Thanks all lets see those posts
07-19-2018, 11:43 AM
#4908
Seasoned Member
Join Date: Oct 2016
Location: Belleview, FL
Posts: 314
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Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
I noticed an immediate increase in power and am currently getting about 19.5 MPG city. That is an increase from approximately 17 MPG before the new exhaust. Sounds killer, too.
YMMV
08-22-2018, 04:47 PM
#4909
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Join Date: Oct 2013
Location: Greenville, SC
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Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
What high flow cats do ya'll have that don't throw check engine lights? I crushed the cat on my 99 pretty bad and it feels gutless now, figured it's probably falling apart and clogging up. It also appears factory so I'm sure it wouldn't hurt to replace anyway.
08-23-2018, 12:29 PM
#4910
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Location: Belleview, FL
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Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
The one in my sig never threw a code at all, works and sounds fantastic. I am very happy. Figure I gained a few HP as well but I have no basis for proving that.
08-28-2018, 09:55 AM
#4913
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Location: Greenville, SC
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Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
I know it was a while back talking about cats, but my Cherokee is 2.25" downpipe to a resonator and it steps up to 2.5" with a 2.5" inlet on the cat and a 2.25" outlet. Not sure if my Cherokee is weird or what the deal is.
08-29-2018, 09:08 AM
#4915
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Model: Cherokee (XJ)
ATP Challenge Y header flange is too thick to seal the intake properly, the bolt and washers are tight on the header flange but not contacting the intake. I've though about possible shimming, grinding the mounting points of the flange or sandwiching the intake port areas of a new gasket onto another to fill the gap, any experience or recommendations?
08-29-2018, 10:56 AM
#4916
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Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by Thedogofwar
ATP Challenge Y header flange is too thick to seal the intake properly, the bolt and washers are tight on the header flange but not contacting the intake. I've though about possible shimming, grinding the mounting points of the flange or sandwiching the intake port areas of a new gasket onto another to fill the gap, any experience or recommendations?
09-04-2018, 01:05 AM
#4917
No, I don't lick fish.
Huh... never knew they put resonators on them. I'd ditch it, personally, but that's just me. Ditched the front resonator on the Chrysler 300m we had and the noise level didn't hardly change.
09-04-2018, 12:20 PM
#4918
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Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by Basslicks
Huh... never knew they put resonators on them. I'd ditch it, personally, but that's just me. Ditched the front resonator on the Chrysler 300m we had and the noise level didn't hardly change.
09-04-2018, 09:24 PM
#4919
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Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
Have this walker cat and i have a flowmaster (44 or 40 idk) muffler that I want to use with it. Was thinking of cutting off the 2 bolt flange from the walker cat and using a reducer to step from the 2.25 diameter of the cat to the 2.5 diameter of the muffler inlet. Would that work?
This
To this
or this if i cut the flange off
To this
This
To this
or this if i cut the flange off
To this
09-04-2018, 09:45 PM
#4920
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Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by Joecam18
Have this walker cat and i have a flowmaster (44 or 40 idk) muffler that I want to use with it. Was thinking of cutting off the 2 bolt flange from the walker cat and using a reducer to step from the 2.25 diameter of the cat to the 2.5 diameter of the muffler inlet. Would that work?
This
To this
or this if i cut the flange off
To this
This
To this
or this if i cut the flange off
To this