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Old July 17th, 2012, 10:03 PM   #1
Catnip 0_o
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Default Feel like lending a hand in educating me with exhaust?

Hello all, just like any other jeep guy ever since I got one its been one add on after another and has become an addiction. I added a cold air intake about 2 months ago and I really like it however I would like to get a new exhaust system as well to accommodate it as well. My issue is that I don't have much knowledge when it comes to exhaust and to be honest how it all works. So before I buy anything recklessly I'd like to learn a little about it, the parts, what they do, what can be improved and how does it improve vehicle performance?

Any input and comments are very appreciated, thank you.
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Old July 17th, 2012, 10:28 PM   #2
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Stacks add horsepower. It's science.
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Old July 17th, 2012, 10:30 PM   #3
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I put a Borla stainless steel cat back system on my jeep around 1998.
It is still there and working good, nor rust or damage. I got my moneys worth.
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Old July 29th, 2012, 01:23 PM   #4
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I doubt you would notice any performance difference with a new exhaust, other than noise level. That being said if you still want new exhaust for your own reasons look for stainless steel to stay away from rust issues, im not sure but I think 304 is the best for exhaust. If you are going to install it yourself then get it from a major manufacturer, its real hard to alter bends in the driveway. you need to decide how loud you want the system to be. Ive known guys who just run straight pipe after the cat. and they like the sound.the more bends and generally less straight equals a little quieter exhaust. same goes for the muffler. hang around some of the other guys and gals and listen to thier rigs and decide what sound you like. One note a muffler on a v8 will sound different than a 6 cylinder
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Old July 29th, 2012, 02:55 PM   #5
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Stacks add horsepower. It's science.
Guy asks a legit question in a tech forum and you have to be an ass. What happened to the rules of respecting a newbie question in tech forums?
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Old July 29th, 2012, 03:00 PM   #6
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if it's on a 4.0 liter a header will improve performance w the cold air intake you already have.putting different muffler most likely wont.running bigger exhaust tubing might get you a little bit.
a nice bolt on kit like a gibson or something along that line might be your best bet.match it with one of there headers.
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Old July 30th, 2012, 10:36 PM   #7
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Guy asks a legit question in a tech forum and you have to be an ass. What happened to the rules of respecting a newbie question in tech forums?
Sorry. I forgot muffler questions were real tech

Real advice then. Unless sound is what you are after, don't worry about it until it needs replacing.
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Old July 30th, 2012, 10:43 PM   #8
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Don't suck on the tailpipe, wait yea do that
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Old July 31st, 2012, 12:21 AM   #9
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My favorite i6 exhaust was one a buddy and I did on his tj. We cut the main cat off, leaving the two little ones up front. Then put a magnaflow in the cats spot, then out to the back with 2.5". We just gave the local muffler shop our dimensions so they could bend it and add hangers, with the muffler included he had about 150 in to it. Its the best sounding straight 6 I've ever heard, mello/refined idle and cruising sound, no popping, and it'd still let you know it was there when you got on it


As for performance, if a sticker adds 10 hp, I'm sure an exhaust adds 50!
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Old August 2nd, 2012, 07:01 AM   #10
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I run an JBN header and full 2.5 pipe back to a Flowmatster 70 Series muffler.. Sounds nice gives a nice low pop when i take it off rev limiter. Much deeper sound then any of my friends 4.0s no drone on the highway either and very little around town..

Power gains? Idk motor burns as much oil as i can put in and is tired after last 10k were all wheeling..
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Old August 2nd, 2012, 08:31 AM   #11
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Quote:
Originally Posted by wadey View Post
My favorite i6 exhaust was one a buddy and I did on his tj. We cut the main cat off, leaving the two little ones up front. Then put a magnaflow in the cats spot, then out to the back with 2.5". We just gave the local muffler shop our dimensions so they could bend it and add hangers, with the muffler included he had about 150 in to it. Its the best sounding straight 6 I've ever heard, mello/refined idle and cruising sound, no popping, and it'd still let you know it was there when you got on it


As for performance, if a sticker adds 10 hp, I'm sure an exhaust adds 50!
at one point I had a 2.5 straight pipe from the cat back on my 01 TJ, and it was pretty similar to having a muffler. It had a bit more throat, but the cat kept it from popping.

One lesson I've learned, don't dump exhaust under the body. Besides the problem of carbon monoxide coming up into the cab, it also causes lots of resonance above. Gets old quick.
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Old August 6th, 2012, 07:53 AM   #12
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i have a cat and a single chamber flowblaster on mine, its loud but thats what i wanted its not a dd anymore either tho
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Old August 6th, 2012, 10:32 AM   #13
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I have 2.5" done from the header back with a generic converter and a glass pack. I think it sounds great, other than the muffler shop running the front pipe kinda low.
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Old August 6th, 2012, 10:45 AM   #14
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I've heard from knowledgeable folks that a free-flowing exhaust doesn't add much to a 4.0. It's not a high-revver and the peak torque is at a relatively low RPM, so bulk movement of air is less of an issue. And like Harleys, too little backpressure can be a bad thing as well for the 4.0.

And no muffler will make it sound like a V8.
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Old August 6th, 2012, 10:59 AM   #15
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We just completely straight piped my buddy's jeep, with a nice stainless tip out the rear.
http://i176.photobucket.com/albums/w...s/0cc96915.mp4


Or it could sound like mine did when I bought it...
http://i176.photobucket.com/albums/w...s/b96ed31d.mp4
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Old August 6th, 2012, 11:15 AM   #16
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Quote:
Originally Posted by Yotabalt View Post
We just completely straight piped my buddy's jeep, with a nice stainless tip out the rear.
http://i176.photobucket.com/albums/w...s/0cc96915.mp4


Or it could sound like mine did when I bought it...
http://i176.photobucket.com/albums/w...s/b96ed31d.mp4
Is that a rod knock!!!
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Old August 6th, 2012, 12:13 PM   #17
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That is a rod knock haha, it's terrible, still like that for the time being., first video is no cat no muffler, second is straight rod knock with muffler hacked off haha.
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Old August 13th, 2012, 05:23 PM   #18
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I went with the banks back cat monster exhaust system and I like the sound of it a lot. Sounds real deep and throaty and is a bit wider than the stock piping. Now I just need some wider headers :D
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Old August 13th, 2012, 07:54 PM   #19
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Not sure if this is a problem on a jeep or not. My advise would be to protect your starter from the extra heat dumped under the hood from the Headers. I have burnerd up one starter and melted a fair bit of wire loom with my Ford inline.
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