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Old 08-12-2007, 02:39 PM   #1
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exhaust manifold replacement

my exhaust manifold has a crack in it. my question is if anyone has used a cheapo off of ebay and if they had any luck with it. how many miles has it lasted so far. how easy/hard was the replacement. which company was it from any special tools needed.

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Old 08-12-2007, 02:49 PM   #2
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I heard good things about the ebay ones with the flex pipes.

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Old 08-12-2007, 02:50 PM   #3
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Old 08-12-2007, 03:09 PM   #4
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in a world with $500 headers, $60 ones sound too good to be true. mines a 99 sahara too. stock
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Old 08-12-2007, 03:13 PM   #5
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There's a site that offers them for like 100.00. I can't remember it offhand, but I know a few memebers have used them with no problems.
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Old 08-12-2007, 03:19 PM   #6
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Quote:
Originally Posted by 4.0l sahara View Post
I heard good things about the ebay ones with the flex pipes.
2x Thats what i've heard too.

I think those were the ones http://cgi.ebay.com/ebaymotors/96-97...ayphotohosting
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Old 08-12-2007, 03:41 PM   #7
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I actually have an Ebay manifold. I've had it on for about 2 years now with no problems what so ever. Paid something like 80 bucks for it including shipping.

It did take a little bit of fitting to get it on exactly right, but the gasket was good and it hasn't warped or tried to back bolts out at all.

There just isn't a header setup that provides enough of a gain over stock for the price they are asking for them in my opinion.
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Old 08-12-2007, 03:51 PM   #8
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I just bought that ebay manifold last night, I hope I can install it myself.
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Old 08-12-2007, 03:59 PM   #9
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the manifold actually looks like a header so i thought i would try an ebay manifold if most people who tried them were satisfied.
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Old 08-12-2007, 04:00 PM   #10
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They all pretty much look the same. The differences are supposed to come from the materials, the quality, and the coatings.
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Old 08-12-2007, 05:30 PM   #11
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bad side is they are not dyno tested and might hurt hp and tq along with gas milage.
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Old 08-12-2007, 06:07 PM   #12
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what size engine do you have? from what I've understood from previous threads is that the 4.0L have headers stock and the 2.5L have manifolds
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Old 08-12-2007, 06:33 PM   #13
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Quote:
Originally Posted by 1BLKJP View Post
They all pretty much look the same. The differences are supposed to come from the materials, the quality, and the coatings.
they do pretty much the same job but dont look the same.. manifolds are cut from a block of metal or they are made from melted metal and they are much thicker while headers are made from bent and welded steel/stainless steel thin but strong piping.

From what i've seen headers are good for natural aspiration engines. Headers can be also used for boosted engines but the piping is thicker. Manifolds are used for many stock applications or low turboed vehicles. Manifolds tend to run quieter since the walls are thicker also they are faster and cheaper to make.

Headers


manifold
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Old 08-13-2007, 05:09 PM   #14
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thanks everyone for the feedback i think i will try one of the ebay ones. for the price i have to try it
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Old 08-13-2007, 05:36 PM   #15
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Trip,

In a jeep bro, I'm gonna have to disagree with you. The manifold and replacement headers look virtually identical. The stock exhaust manifolds don't look like what you posted either.



Quote:
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they do pretty much the same job but dont look the same.. manifolds are cut from a block of metal or they are made from melted metal and they are much thicker while headers are made from bent and welded steel/stainless steel thin but strong piping.

From what i've seen headers are good for natural aspiration engines. Headers can be also used for boosted engines but the piping is thicker. Manifolds are used for many stock applications or low turboed vehicles. Manifolds tend to run quieter since the walls are thicker also they are faster and cheaper to make.

Headers


manifold
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Old 10-01-2007, 09:14 AM   #16
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exhaust manifold problems..

My exhaust manifold is cracked...Jeep dealer diagnosed it...they want $750 (ouch)....I have been riding at least a yr with it this way (sound, etc.
They said I could drive it with it the way it is, but that it will need to be replaced?
Anyone else have insight to this?
1) other options for a non-jeep dealer to fix?
2) any damage to the engine if I drive it further until I can pay for it?
3) anything else?

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My first post btw.1999 tj
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Old 10-01-2007, 09:26 AM   #17
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This can be a DIY job if you have tools and a service manual. Nothing too hairy involved in swapping them out. I'd suggest finding a decent replacement.
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Old 10-01-2007, 11:43 AM   #18
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FYI - Exhaust manifolds are sand cast and then machined. Headers are tube steel that is mandrel bent and welded.

Manifolds have more mass and can absorb heat better. Headers have less mass and radiate more heat.

Manifolds are typically not port matched to the head(s) and have more flow resistance. Headers are typically port matched and are specificaly designed to reduce flow = more hp.
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Old 10-01-2007, 01:52 PM   #19
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Bought a $100 special and had it replaced in about an hour with no difficulty. I'd never done anything like that before. Just label everything you undo first.

It was really easy.

Mine's a 97 4.0 with a little over 100k on the clock.
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Old 10-01-2007, 05:13 PM   #20
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Man, I went to a jeep dealer...quote=$750
Then I went to a shade tree setup (ok...good mechanic shop)..quote=$640
part=350
labor $58/hr...x 4hrs=243.60
EPA charge $5.
Whats up with this for an exhaust manifold?
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Old 10-01-2007, 05:55 PM   #21
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Quote:
Originally Posted by gammy View Post
Man, I went to a jeep dealer...quote=$750
Then I went to a shade tree setup (ok...good mechanic shop)..quote=$640
part=350
labor $58/hr...x 4hrs=243.60
EPA charge $5.
Whats up with this for an exhaust manifold?
Well the labor quote you have there sounds good. The part you can get way cheaper. I run the ebay manifold that I spent a grand total of 80 bucks on including shipping. It's been in for over 2 years now with no problems. But it is a labor intensive job.
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Old 10-01-2007, 06:17 PM   #22
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Jack i think he was showing us the 4 squirle model like what i have.
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Old 10-01-2007, 06:26 PM   #23
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Jack i think he was showing us the 4 squirle model like what i have.
Dolp, my bad. Thanks for the info. Guess I should actually read more than just posting. Did a quick ebay search and 2.5L Jeep Exhaust Manifold's are even cheaper.
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Old 10-01-2007, 08:09 PM   #24
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will most mechanics work with the manifold you bring them? I guess I could ask.
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Old 10-02-2007, 12:01 AM   #25
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will most mechanics work with the manifold you bring them? I guess I could ask.
I honestly don't see why they wouldn't. It would save them the trouble of sitting down to order the part and getting it to their shop.
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Old 10-02-2007, 06:34 AM   #26
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