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Old 11-05-2007, 02:03 PM   #1
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Do Jeeps benefit from a bigger/better exhaust system?

I have a '91 that I just got recently. I crawled underneath it to see what's happening down there system wise.

That's one hell of a convoluted set up for the exhaust! Will I be wasting my time and dollars to go with a bigger diameter exhaust piping and better muffler or will it actually help the Jeep?

Thanks!
MANGO

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Old 11-05-2007, 02:04 PM   #2
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4cl or 6?

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Old 11-05-2007, 04:03 PM   #3
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6 cylinder manual 4x4
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Old 11-05-2007, 04:24 PM   #4
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itll give you a few more HP, but nothing youll really notice much. but a Flowmaster 40 sounds bad ass on the 4.0s. ive never heard a 6 cyl sound more like an 8 cyl then with a flowmaster 40
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Old 11-05-2007, 04:38 PM   #5
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how about on a 4cyl?
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Old 11-05-2007, 05:01 PM   #6
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4 banger

Should help a little. Take the restrictors out of your stock air box (if you still have one) and stick on a 4.0 Throttle body so you get more air coming in as well.
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Old 11-05-2007, 05:09 PM   #7
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thanks.
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Old 11-06-2007, 04:45 AM   #8
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Well I have an 87 4.2 and I have 2.5" pipe from the manifold back with a high flow cat with a flowmaster 40 series and I noticed quite a difference. Now of course mine is nutered and I also have the big Webber on it. I have 3.07 gears in it with 31's and my 92 T-bird w/ 5.0L has to work a bit to keep up with it. Granted my T-bird has 3.08 gears but the T-bird is pretty quick still. So I would say do the exhaust. But do it with the high flow for sure and 2.5" pipes. And yes the flowmaster really makes it sound good.
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Old 11-06-2007, 05:13 AM   #9
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Just to add
Almost every vehicle will benefit from a better free-flowing exhaust. Factory always restricts vehicles for many reasons like emissions and noise reductions.
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Old 11-06-2007, 10:04 AM   #10
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I have 4 squirrels under the hood

I did:

4.0 TB
Rusty's open air filter kit
Bigger pipe from the manifold back + a turbo muffler

I noticed better throttle response, smoother idle, and a good sound.
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Old 11-06-2007, 06:13 PM   #11
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Thanks Folks!!

Any recommendations on a good high flow cat?
What should I expect to pay for a Flowmaster 40 Series?
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Old 11-06-2007, 08:58 PM   #12
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Just my .02, When I researched my exhaust for my s10 I wanted something that flowed well but didn't want to get tickets for loud exhaust all the time. Everyone said Dynomax had a better flow than Flowmaster and Magnaflow but was just a little louder than stock. At idle you can't tell too much but when you get on it you know its there.
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Old 11-06-2007, 10:49 PM   #13
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Thanks Folks!!

Any recommendations on a good high flow cat?
What should I expect to pay for a Flowmaster 40 Series?
The one sitting in the box in my garage would be perfect for you. It is a Catco from Summit. A better flowing exhaust system will help any engine, even your lawn mower. Something else to consider though, if you help get the air out better you need to get the air in better too. To get the full potential out of a free flowing exhaust you need a better intake system too.
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Old 11-07-2007, 11:36 PM   #14
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DaddyJeep,

What size diameter inlet/outlet does that Catco you have have?
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Old 11-14-2007, 10:23 PM   #15
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i tore all my old exhaust out..replaced it with a rugged ridge/banks header and down pipe, dynomax cat and a borla cat-back..all stainless..it made a difinite difference in performance and sounds good..

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