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Old 12-29-2013, 08:56 PM   #1
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4.0 Exhaust advice

Hey everybody..

I've been interested in replacing my old rusty stock exhaust on my 95 Sahara 4.0 with something that sounds a bit more badass. I've seen a lot of stuff online about guys with 4.0s making their jeeps sound like they have v8s from the exhaust. Don't get me wrong, I'm not trying to wake up my neighbors and be an obnoxious teenager... But.. I think that if these kids in their rice-burners with fart cans think it's okay, then I want them to envy my American piece of machinery.

Also, I'm new to jeeps and young, and I'm always looking to learn about jeeps and automobiles in general. I really don't know too much about exhaust besides each part's basic functions, so any advice would be greatly appreciated. I'm really not looking for a change in performance/mileage, just a beefier sound that isn't too obnoxious.

Would it be necessary to replace my entire exhaust system? Would just a new pipe make any difference in sound? How about replacing/removing the cat. converter?

Thanks!

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Old 12-29-2013, 09:17 PM   #2
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If it can be afforded, doing the whole exhaust (header and all) will give you the best results. Removing the cat is illegal, but it's done by some people anyways. Personally I would get an aftermarket cat with the new system. Since the aftermarket cat won't be very restrictive ( in my opinion) and you don't have to worry about getting in trouble with the law. As far as brand, everyone has their opinion. I would suggest a lot of YouTube searches to find the sound you want.

Hope this helps

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Old 12-29-2013, 09:34 PM   #3
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Thanks! I've been on YouTube and a lot of people have flowmaster 40. Do you think just a muffler would make a difference or would it have to be a cat back system?
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Old 12-29-2013, 09:41 PM   #4
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A muffler would make a difference. But the more you do, the more it'll change. I would say save up until you can get a cat back. Then if you want more, you can replace the cat and add a header.
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Old 12-29-2013, 09:49 PM   #5
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If I were to just get a muffler for now and remove the cat.converter (I'm aware with the law) would removing the cat. give it a better sound?
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Old 12-29-2013, 10:36 PM   #6
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Some say yes. Personally I don't know.
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Old 12-29-2013, 10:40 PM   #7
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I had a magnaflow on my old zj with the 4.0. Gave it a nice low growl
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Old 12-29-2013, 10:48 PM   #8
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Quote:
Originally Posted by ddferdt View Post
I had a magnaflow on my old zj with the 4.0. Gave it a nice low growl
Was that just the muffler?
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Old 12-29-2013, 10:53 PM   #9
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Quote:
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Was that just the muffler?
Yes, everything else was stock
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Old 12-29-2013, 10:58 PM   #10
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Quote:
Originally Posted by ddferdt View Post

Yes, everything else was stock
Cool, thank you!
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Old 12-30-2013, 01:53 AM   #11
Guesses a lot ;)

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I have a magnaflow and it sounds great. No cat on mine... Its also one of the toughest parts under the jeep as far as rocks and stuff go.
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Old 12-30-2013, 08:06 AM   #12
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I have Borla headers and Flowmaster and it sounds much better, but I don't want to get your hopes up....it's no V8. I wish my Jeep sounded like my 6.0 Chevy 2500HD, but alas it is not as deep, or rumbling as my V8, someday I'll of a V8 conversion and be completely happy.
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Old 12-30-2013, 09:55 PM   #13
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The only thing that sounds like a V8, is a V8, not even a Straight 8.
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Old 12-30-2013, 10:43 PM   #14
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I threw a $37 Thrush Welded on mine. It's a tad growlier and louder than the Flowmaster it imitates. It's the best I've heard on a 4.0 so far in my opinion.
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Old 12-31-2013, 12:24 PM   #15
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I straight piped mine a few weeks ago. 3 in pipe all the way out the back....... and a $375 noise ordinance ticket haha
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Old 12-31-2013, 08:11 PM   #16
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I straight piped mine a few weeks ago. 3 in pipe all the way out the back....... and a $375 noise ordinance ticket haha
Gee, you fit right in with those young kids and their "fart can" exhaust, dontcha? Sure it makes noise but seriously, you are doing more harm than you think. The motor is designed to run with a certain amount of back pressure from the exhaust. A straight pipe exhaust is for a diesel, not a gas motor.

To the OP...I have magna-flo custom from the manifold to the back of the Jeep. 2.75" pipe, but unlike Mr. straight pipe, I have a magna-flo cat as well as a 3" bullet muffler. It has a low rumble and sounds good, but its still not as impressive as a V8 growl.
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Old 12-31-2013, 09:33 PM   #17
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The back pressure helps on low RPMs TQ, and the more open, helps with high RPMs H.P.
It's a jeep.
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Old 12-31-2013, 11:03 PM   #18
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I saved and did it all at once, the exhaust system is an air pump system , more air in more air out. I went with a 62mm throttle body on a ceramic coated TJ intake with larger injectors... Also rv cam...

Banks header ceramic coated, matched port and polished head, magna flow high flow cat, banks cat back system.

If your gonna start and piece it together I would do cat back, then header.
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Old 01-01-2014, 11:50 AM   #19
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Quote:
Originally Posted by Jrozar View Post
I saved and did it all at once, the exhaust system is an air pump system , more air in more air out. I went with a 62mm throttle body on a ceramic coated TJ intake with larger injectors... Also rv cam...

Banks header ceramic coated, matched port and polished head, magna flow high flow cat, banks cat back system.

If your gonna start and piece it together I would do cat back, then header.
That sounds like a nice system for Mid and High RPMs, about the same that I plan for my Heep, if I ever finish the 4.7 engine. It should have a good low RPM TQ with the long stroke engine vs a 4.0s stroke, so even with what I lose on the bottom end with the High Flow, I'll make up with the long stroke of the 4.7.
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Old 01-01-2014, 05:49 PM   #20
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I put a $20 cherry bomb muffler from fleetfarm and a $15 walker tailpipe and it sounds awesome even with stock cat and headers
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Old 01-01-2014, 07:03 PM   #21
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I put a $20 cherry bomb muffler from fleetfarm and a $15 walker tailpipe and it sounds awesome even with stock cat and headers
Awesome, I'm definitely gonna check out that combo
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Old 01-01-2014, 08:55 PM   #22
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If you plan on doing the whole exhaust, have the pipe between the header and cat wrap around the front of the oil pan like the TJ is set up. Gets the pipe out of the way and you gain more clearance.
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Old 01-01-2014, 09:01 PM   #23
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Originally Posted by djwrangler View Post
If you plan on doing the whole exhaust, have the pipe between the header and cat wrap around the front of the oil pan like the TJ is set up. Gets the pipe out of the way and you gain more clearance.
I don't think I'm gonna do the entire exhaust any time soon since I'm currently saving for a lift and bigger tires. But I'll definitely keep that in mind
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Old 01-02-2014, 12:33 PM   #24
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Gee, you fit right in with those young kids and their "fart can" exhaust, dontcha? Sure it makes noise but seriously, you are doing more harm than you think. The motor is designed to run with a certain amount of back pressure from the exhaust. A straight pipe exhaust is for a diesel, not a gas motor.

To the OP...I have magna-flo custom from the manifold to the back of the Jeep. 2.75" pipe, but unlike Mr. straight pipe, I have a magna-flo cat as well as a 3" bullet muffler. It has a low rumble and sounds good, but its still not as impressive as a V8 growl.
I know man. She was only straight piped for 2 weeks. Glass pack now. Didn't wanna burn valves up. Not as loud now but has a good deep tone
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Old 01-02-2014, 01:10 PM   #25
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But I have had plenty of straight piped trucks and Jeeps. Its caused zero problems. Its got advantages and disadvantages
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Old 01-02-2014, 11:54 PM   #26
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i have a super 44 and borla headers and i think it sounds great not to loud unless your on it hard but people look to see what is comming. it has a nice deep growl when your cruzing
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Old 01-03-2014, 12:32 AM   #27
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i have a super 44 and borla headers and i think it sounds great not to loud unless your on it hard but people look to see what is comming. it has a nice deep growl when your cruzing
Sweet! Would you recommend the super 44 over the 40?
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Old 01-03-2014, 11:06 AM   #28
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Here is a few picks of my exhaust system...as we know air in air out....

62 MM BBK throttle body, adjustable fuel regulator and higher flow injectors



Yella Terra roller rockers...



TJ Intake with Banks header both Ceramic Coated...



Banks Monster Muffler



Im also running a magnaflow high flow cat...

Keep the engine compartment as cool as possible cold air creates horsepower much easier than hot! Genright Louvers, three on top two on the sides..



ARB Snorkle pulling cooler air from outside instead of under the hood...plus facing forward its almost like ram air...


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