all muffler and exhaust questions go here!!!!!!
CF Veteran
Joined: Aug 2011
Posts: 1,994
Likes: 8
From: San Jose
Year: 89
Model: Cherokee
Engine: 4.0 I6
do we have any NON RENIX recent pacesetter header installs? I've been searching for quite some time regarding these headers. the only issue i'm concerned with is having the downpipe hit the ujoint ears. my jeep is stock, never goes offroad, and will stay as such. I read where one fellow had this issue and his interaction with pacesetter concluded with...pacesetter was going to make an honest effort investigating the problem and attempt to correct it. naturally the thread ended shortly thereafter with no closure. that thread was almost a year old at this point. thanks in advance, any help is appreciated.
Seasoned Member
Joined: Aug 2009
Posts: 338
Likes: 0
From: maine
Year: 1989
Model: Cherokee
Engine: 4.0 straight 6
Im getting this annoying rattle the rock inside the cat is breaking loose. so the cat is basicly junk I was thinking about replacing it but don't know if stock or aftermarket is the way to go I already have a brand new exhaust new front pipe replaced the stock muffler with a flowmaster. I could prolly drive around all winter with the junked out cat but if I was to replace the stock cat would I get any noticeable gains with a magnaflow or flowmaster cat. what would someone on a budget use that would improve milage and horsepower
CF ADMIN

Joined: Sep 2010
Posts: 34,088
Likes: 257
From: Lantana, Fl
Year: 1996
Model: Cherokee (XJ)
Engine: 4.Slow
Im getting this annoying rattle the rock inside the cat is breaking loose. so the cat is basicly junk I was thinking about replacing it but don't know if stock or aftermarket is the way to go I already have a brand new exhaust new front pipe replaced the stock muffler with a flowmaster. I could prolly drive around all winter with the junked out cat but if I was to replace the stock cat would I get any noticeable gains with a magnaflow or flowmaster cat. what would someone on a budget use that would improve milage and horsepower
Senior Member
Joined: Jul 2012
Posts: 503
Likes: 0
From: North West Ohio
Year: 2000
Model: Cherokee
Engine: 4.0 liter in-line six
Not to mention, a high-flow is cheaper than a stock one.
Senior Member
Joined: Jun 2012
Posts: 524
Likes: 1
From: PA
Year: 1998
Model: Cherokee
Engine: 4.0L I6 Power Tech Engine
Im getting this annoying rattle the rock inside the cat is breaking loose. so the cat is basicly junk I was thinking about replacing it but don't know if stock or aftermarket is the way to go I already have a brand new exhaust new front pipe replaced the stock muffler with a flowmaster. I could prolly drive around all winter with the junked out cat but if I was to replace the stock cat would I get any noticeable gains with a magnaflow or flowmaster cat. what would someone on a budget use that would improve milage and horsepower
Senior Member
Joined: Jun 2012
Posts: 524
Likes: 1
From: PA
Year: 1998
Model: Cherokee
Engine: 4.0L I6 Power Tech Engine
Alright guys I need your help once again, I got the Jegs cat back exhaust but found out the whole system from manifold down is in really bad shape so I am going to replace it all. Who and where can I find the pipe from manifold to cat with the o2 sensor bumg welded in? And does anyone make a high flow cat with o2 sensor bung welded in?
CF Veteran
Joined: Nov 2011
Posts: 2,433
Likes: 6
From: Northern MN
Year: 1990
Model: Cherokee (XJ)
Engine: Renix 4.0
Alright guys I need your help once again, I got the Jegs cat back exhaust but found out the whole system from manifold down is in really bad shape so I am going to replace it all. Who and where can I find the pipe from manifold to cat with the o2 sensor bumg welded in? And does anyone make a high flow cat with o2 sensor bung welded in?
Junior Member
Joined: Apr 2013
Posts: 87
Likes: 0
From: SoCal951
Year: 98'
Model: Cherokee
Engine: 4.0
Can I just replace my stick cat with a high flow one at any time? I'm in CA btw ..... I thought I read somewhere that you can't just change it with out it failing a emissions test.... Please clarify my confused mind on this
Senior Member
Joined: Jun 2012
Posts: 524
Likes: 1
From: PA
Year: 1998
Model: Cherokee
Engine: 4.0L I6 Power Tech Engine
Alright guys I need your help once again, I got the Jegs cat back exhaust but found out the whole system from manifold down is in really bad shape so I am going to replace it all. Who and where can I find the pipe from manifold to cat with the o2 sensor bumg welded in? And does anyone make a high flow cat with o2 sensor bung welded in?
I installed this on my 98, bolted right up and already has a hanger welded in that was correct


