- Reply to Topic
Thread: WJ replacement exhaust headers Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
07-09-2021 06:36 PM
Originally Posted by Jeepsmsc2 View Post
Do all the aftermarket headers on the market really crack?

if they did, do you believe they would still be in business? some guys report issues, but i'd want to see the system before i blamed the header. bad motor mounts, missing exhaust hangers, incorrect installation numbers, etc. heavywall headers, with a thick, plate mounting flange, and good, penetrating welds all the way around, with proper support to take the weight of the front half of the exhaust off the mounting flange, and you should have no problems. companies that build ****ty products tend not to last long, in a niche market. a lot of problems with products can be traced back to user error. imo.
07-08-2021 09:09 PM
Jeepsmsc2 Since I have to replace the cracked intake manifold and gasket, the original exhaust header has to come off anyway.

I have read the 4.0 exhaust headers are very prone to cracking. Mine has not cracked yet, but it has close to 200K miles and 20 years of service. Should I keep the old OEM header? Or replace it with new aftermarket at the same time the intake and gasket are replaced?

Do all the aftermarket headers on the market really crack?
06-22-2021 01:29 PM
Originally Posted by Jeepsmsc2 View Post
Are OEM Mopar headers available new. Or are these long since out of production?
The stock piece?

If so, it's discontinued.

Crown and a few others make repops of it though.

Attachment 3994177
06-22-2021 10:42 AM
Jeepsmsc2 Are OEM Mopar headers available new. Or are these long since out of production?
06-21-2021 03:58 PM
Wheelin98TJ Aftermarket 4.0 headers have cracking problems. They all do.

No way I'd swap it.
06-21-2021 01:50 PM
cDee63 To answer your question there are quite a few quality headers available for the 4.0, if it was mine I would spend the big coin on a Banks.
06-21-2021 12:26 PM
Jeepsmsc2 Roger that.
06-21-2021 12:05 PM
cDee63 Well now that changes things, put that in description if you would please. Makes things easier on all of us trying to help.
06-21-2021 10:06 AM
Jeepsmsc2 4.0
06-21-2021 09:52 AM
leadsled jeep OP what engine you questioning it on?
06-21-2021 09:35 AM
Jeepsmsc2 The intake manifold is being replaced and the gasket is being replaced. The header is coming off anyway
06-21-2021 05:33 AM
cDee63 I can tell you from experience getting exhaust manifolds off when the heads are on is a PITA. However it is much easier than trying to get them back on with the heads installed, it's pretty much impossible to get the bolts in the bottom with the heads installed. It's a "if it's not broke don't fix it" senario.
06-20-2021 10:17 PM
WJ replacement exhaust headers

Any recommendations on a good quality replacement header that will be used for daily driving?

My intake manifold has a crack, so I figure it might make sense to replace the header at the same time since they are prone to cracking was well.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

For the best viewing experience please update your browser to Google Chrome