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Unread 10-22-2013, 02:59 AM   #1
chuck172
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exhaust manifold

I've been hearing that the exhaust manifold will crack no matter what. No sense in getting an expensive one.
Seems hard to believe that a new manifold is destined to be short lived. I'd hate to do the job over and over.
How do the dorman's size up?
http://www.amazon.com/Dorman-Solutio...ype=automotive

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Unread 10-22-2013, 04:53 AM   #2
ashland82391
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Quote:
Originally Posted by chuck172 View Post
I've been hearing that the exhaust manifold will crack no matter what. No sense in getting an expensive one.
Seems hard to believe that a new manifold is destined to be short lived. I'd hate to do the job over and over.
How do the dorman's size up?
http://www.amazon.com/Dorman-Solutio...ype=automotive
This is not true. My zj has 270,000 miles on it with the original exhaust manifold. Yes, that looks like a good one.
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Unread 10-22-2013, 06:05 AM   #3
Que89YJ
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Get a header. The stock manifolds are cast and are prone to crack but the header is much better. The collecting tubes are always the weak point. The header heats quicker and has much more flex. The price for a header is competitive too. The one in your link is a header. The subject has been covered in a few threads:
http://www.jeepforum.com/forum/f12/best-header-1377595/

The big thing with the cracking is flex in the exhaust. The hangers get loose or rust and stop supporting the exhaust and the exhaust system pivots on the remaining hanger and jams the manifold. The flex built into the one in your link is good, but make sure the hangers are good and you have support all the way along the system.
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Unread 10-22-2013, 06:45 AM   #4
baktie_91YJ
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Another thing you can do with headers to prevent cracking is run flex pipe close to the collector to change where the flex happens
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Unread 10-22-2013, 08:00 AM   #5
WDNewman
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I have an '89 with close to 160k on the odometer and it has the original stock cast exhaust manifold. No problems. Don't know about the 4.2 or the 4.0 though.

Last edited by WDNewman; 10-22-2013 at 08:00 AM.. Reason: mis-spelling
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Unread 10-22-2013, 08:54 AM   #6
chuck172
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I don't think all the exhaust manifolds are cast. What makes a header a header- steel tubes?
My yj has steel tubes, and I believe it's stock.
Good news on the dorman. Now is the dorman a header or an exhaust manifold?
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Unread 10-22-2013, 09:21 AM   #7
Que89YJ
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Headers have individual pipes to the collector for each exhaust port and are "tuned" for easy flow. That is a steel manifold.
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Unread 10-22-2013, 03:18 PM   #8
imstillatwork
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You can get that one from Amazon on Ebay for about $90

Very good quality FOR THE MONEY.
You might need to get the die grinder out and clean up some welds, but for $90, not bad at all.
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Unread 10-22-2013, 09:09 PM   #9
deathtrap
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Ive had the dorman one on my 93 for about 4 years. It came with a gasket but I used a oem mopar gasket. so far no cracks or leaks.
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Unread 10-23-2013, 02:37 AM   #10
chuck172
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Quote:
Originally Posted by imstillatwork View Post
You can get that one from Amazon on Ebay for about $90

Very good quality FOR THE MONEY.
You might need to get the die grinder out and clean up some welds, but for $90, not bad at all.
Would you please provide the link?
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Unread 10-23-2013, 02:39 AM   #11
chuck172
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Quote:
Originally Posted by deathtrap View Post
Ive had the dorman one on my 93 for about 4 years. It came with a gasket but I used a oem mopar gasket. so far no cracks or leaks.
Did you buy gasket from the stealership or somewhere else?
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Unread 10-23-2013, 10:24 AM   #12
ionakana
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Quote:
Originally Posted by chuck172 View Post
Would you please provide the link?
just go on ebay and search "Jeep YJ exhaust manifold". I just bought one for $90 as well and that included shipping. Real happy with the quality.




Not to hi-jack the thread but should I paint it?
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Unread 10-23-2013, 10:38 AM   #13
jeepster93
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No, don't paint it.

But...
You could polish it....

This is my Ebay special. Paid $125 for it, free shipping and a new gasket.




The same thing after a quick polish.

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Unread 10-23-2013, 12:42 PM   #14
Anticanman
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I'm telling ya, talk with this guy about one with the expansion tubes.

http://jeepspace.jeepforum.com/1ATony
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Unread 10-23-2013, 02:58 PM   #15
Que89YJ
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Forum discount through him I bet. Good call!
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