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Old 11-15-2012, 01:42 PM   #1
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TJ Exhaust System

Hey guys, I have read and researched all the exhaust threads out there and still need some help. I don't understand exactly the layout of the exhaust and the difference between cat backs and etc. I want to upgrade my exhaust on my 1997 I6, I want it louder than it is currently. I definitely don't want one of those loud,annoying exhausts. I just want it deeper and noticeable to make the engine sound better. Thanks
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Old 11-15-2012, 01:47 PM   #2
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Cat backs are usually bolt on exhaust systems that replace everything from the cat on back. The other option is to cut the muffler out with a sawall and weld in new muffler.

I went with a Thrush Welded for about $30 and also needed a small section of 2 1/4" exhaust pipe....then 3 welds. If you pick up a Thrush Welded (#17651) and took it in to a local exhaust shop to have it installed, I bet the total project would be about $60-$80.

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Old 11-15-2012, 01:51 PM   #3
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If you crawl under your jeep and look up into the skid plate you will see two larger items on the exhaust the one closer to the front is the third cat and the on closer to the back is the muffler. In between them in a flange mount. Cat backs will remove everything after the flange mount and replace it.

Headers will replace the exhaust manifolds that connect to the engine.

I have the MBRP cat back and love the sound it makes, deeper growl but not extremely loud and only a small amount of drone at idle.
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Old 11-15-2012, 02:56 PM   #4
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Quote:
Originally Posted by Dextreme View Post
Cat backs are usually bolt on exhaust systems that replace everything from the cat on back. The other option is to cut the muffler out with a sawall and weld in new muffler.

I went with a Thrush Welded for about $30 and also needed a small section of 2 1/4" exhaust pipe....then 3 welds. If you pick up a Thrush Welded (#17651) and took it in to a local exhaust shop to have it installed, I bet the total project would be about $60-$80.
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Originally Posted by homebrwd View Post
If you crawl under your jeep and look up into the skid plate you will see two larger items on the exhaust the one closer to the front is the third cat and the on closer to the back is the muffler. In between them in a flange mount. Cat backs will remove everything after the flange mount and replace it.

Headers will replace the exhaust manifolds that connect to the engine.

I have the MBRP cat back and love the sound it makes, deeper growl but not extremely loud and only a small amount of drone at idle.
First of all, thank you for the responses! I dont think I want to replace the headers. Will that effect the sound a lot? I read that cat backs usually cost more than than they should. Also, i cannot weld so would would a thrush weld exhaust and then taken to exhaust shop be the best way to achieve the sound im looking for?

Basically I think I want a louder growl when accelerating and when at idle at little roar and when driving it to be not obnoxious.

Thanks again guys, really want to get this done!
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Old 11-15-2012, 02:59 PM   #5
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Yeah any good exhaust shop should be able to weld in a muffler for you. The catbacks are pricey but you'll have a better idea of what you are getting as far as sound goes (generally you'll find more youtube videos and such of cat back systems) I would say get onto youtube and start looking(listening). Make sure you use a decent set of speakers or headphones so you can listen for drone.
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Old 11-15-2012, 03:05 PM   #6
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Quote:
Originally Posted by tcate23-WRANGLER View Post

Basically I think I want a louder growl when accelerating and when at idle at little roar and when driving it to be not obnoxious.
I think you pretty much described the Thrush Welded. It has a deep tone but won't be annoying.
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Old 11-15-2012, 03:22 PM   #7
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Quote:
Originally Posted by homebrwd View Post
Yeah any good exhaust shop should be able to weld in a muffler for you. The catbacks are pricey but you'll have a better idea of what you are getting as far as sound goes (generally you'll find more youtube videos and such of cat back systems) I would say get onto youtube and start looking(listening). Make sure you use a decent set of speakers or headphones so you can listen for drone.
Just did this and watched several videos. Is a glasspack a good idea? And whats the difference between the exhaust facing out compared to down?
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Old 11-15-2012, 03:28 PM   #8
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Just did this and watched several videos. Is a glasspack a good idea? And whats the difference between the exhaust facing out compared to down?

Down is called a "turn down" and makes the sound resonate off of the pavement, as to where out directs the sound away from you.. Out is the way to go IMO; much less drone..
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Old 11-15-2012, 03:28 PM   #9
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For what it's worth, I had a GMC Canyon with the 5 cylinder, put a MBRP cat-back system on it and it sounded great. When I'm done doing more important things to my TJ, that's what I'm going to buy for mine.
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Old 11-15-2012, 03:29 PM   #10
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I have had glass packs before and they sound very Honda ricey and they tend to get louder and louder as the glass burns out. Also they don't really deepen the sound very much.
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Old 11-15-2012, 03:29 PM   #11
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Quote:
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Down is called a "turn down" and makes the sound resonate off of the pavement, as to where out directs the sound away from you.. Out is the way to go IMO; much less drone..
x2.......you'll regret a turndown system. Drone will drive you nuts.
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Old 11-15-2012, 03:32 PM   #12
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X2 on the thrush welded. I have one and love it. Best $39 I've ever spent!
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Old 11-15-2012, 03:38 PM   #13
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ps Glasspacks aren't bad from my experience. I had one on my 6 cyl ranger and I liked it, until I got my flowmaster 40 series lol..

*EDIT*

My Glasspack was like 28" long though, and I have heard that the longer the better as far as not sounding "ricey"
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Old 11-15-2012, 04:57 PM   #14
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Appreciate all the help everyone. What exactly is thrush welded? Like I said before I just want it a little deeper on startup and acceleration but not too annoying. Also from what I understand having it faced out would be the best? Thanks
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Old 11-15-2012, 05:01 PM   #15
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Old 11-15-2012, 05:53 PM   #16
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That seems cheap to make a difference but I'm probably wrong. Seems like most if you guys are agreeing that the thrush welded is good and loud but not annoying. Not to pricey and I would just have to get it welded correct? As for the end tip, do I use my stock one? Thanks again
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Old 11-15-2012, 06:53 PM   #17
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What about a stainless pipe from the header back with a thrush welded and maybe eliminate the 3rd cat?
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Old 11-15-2012, 07:01 PM   #18
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Quote:
Originally Posted by tcate23-WRANGLER
What about a stainless pipe from the header back with a thrush welded and maybe eliminate the 3rd cat?
Love living where I do! I only have 1 cat.
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Old 11-15-2012, 07:11 PM   #19
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Love living where I do! I only have 1 cat.
Is that what you did with your thrush? What does eliminating the cat or one of them do?
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Old 11-15-2012, 10:58 PM   #20
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Love living where I do! I only have 1 cat.
What does living where you do have to do with how many catalytic converters you have? And what happened to your pre-cats?
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Old 11-15-2012, 11:03 PM   #21
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Quote:
Originally Posted by TJspeed

Love living where I do! I only have 1 cat.
I think this has to do with year of jeep, not location. I think newer TJs had the 3 cats or whatever it was while older ones only have one.
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Old 11-15-2012, 11:09 PM   #22
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I think this has to do with year of jeep, not location. I think newer TJs had the 3 cats or whatever it was while older ones only have one.
Correct, and his 2000 came with 3 cats. I was wondering how they got away with removing the front cats. (He's my nephew)
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Old 11-15-2012, 11:15 PM   #23
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Quote:
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Correct, and his 2000 came with 3 cats. I was wondering how they got away with removing the front cats. (He's my nephew)
My Jeep only has 1 cat. My ZR2 only had 1 cat as well.
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Old 11-15-2012, 11:17 PM   #24
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My Jeep only has 1 cat. My ZR2 only had 1 cat as well.
Your Jeep has 3, unless someone removed the front two, which is no real easy task. What year was your Blazer? Starting in 01 they had 2 .
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Old 11-15-2012, 11:19 PM   #25
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Quote:
Originally Posted by Patrick H

Your Jeep has 3, unless someone removed the front two, which is no real easy task. What year was your Blazer? Starting in 01 they had 3 as well.
My blazer was a 2000 as well.
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Old 11-15-2012, 11:21 PM   #26
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My Jeep only has 1 cat. My ZR2 only had 1 cat as well.
Go look under the intake manifold at the pipes coming off the exhaust manifold.

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Old 11-15-2012, 11:21 PM   #27
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My blazer was a 2000 as well.
2000 Blazer only had one. Your Jeep has 3
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Old 11-15-2012, 11:28 PM   #28
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Quote:
Originally Posted by Patrick H

2000 Blazer only had one. Your Jeep has 3
Ok. Originally. I didn't know the first 2 where that high up. But I only have 1 still. Looks factory.

Attachment 178804



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Old 11-15-2012, 11:32 PM   #29
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I thought 2000 was the first year for 3 cats. Does look factory.

Has the older style manifold as well. What's the production date of your Jeep?
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Old 11-15-2012, 11:35 PM   #30
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Quote:
Originally Posted by Patrick H
I thought 2000 was the first year for 3 cats. Does look factory.
Mine was early 2000. I don't know if that would make a difference. But yeah only cat is the main one right before the muffler.

Production is 1-00

I thought 2000 was the start of the newer manifold?

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