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Old 06-27-2013, 06:41 PM
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3.7 WK Headers install pics and hints

its about
JBA - jbaheaders.com
# 1930S





They are originated for KJ,but they fits WK also.


Some 16 months ago i found them damn cheap on ebay (seller: exhaustseller).

I was looking for aftermarket headers cause mine stock start to sound like cracked ones.


Friend of mine instaled them for me some 7 months ago. Instalation took some 5hours for single person.


As reported by STRONGJEFF in the 3.7 lovers thread (3.7l performance love), there is possible for the 2008+ models, that the JBA headers rubs a bit on the steering.





To avoid this, we created a smal dimple in the critical area into the header to become more space.



But as other jeepers reported later on, for the 2005 models there is no need to do that. They dont rub for on the steering.
My install detail confirms:




I used also Thermotec Generation II Copper Exhaust Insulating Header Wrap and Adhesive Backed Heat Barrier from Thermotec.com to avoid any danger for the steering.
IT works!



This wrap-mod casuses also, your gasses are blowen out from the headers much faster. This is good for hp gain.
Thermo-Tec : Adhesive Backed Heat Barrier
Thermo-Tec : Generation II Copper Exhaust Insulating Header Wrap

Its recomended to use thermotec special spray before you instal the wrapped headers. Thermo-Tec : Hi-Heat Coating
The wrap longevity becomes major improovement. Be also sure, you have some of theirs thin steel heat clamps. They are needed to secure the wrap ends.

For the instalation i used brand new stock header sealing from mopar. (I lost the JBA sealing somewhere) It works also.

I used the 4 stainless steel bolts and nuts delivered fith JBA to mount the exhaust pipes to the headers. This was a big fail. There is no rust to make then tight enought so they are still getting loose by the machine vibration.

After second atempt to make them tight during some 3000 miles, i changed them for some longer, not stinless bolts and i used two nuts on each bolt to make them stable. And they are.

Its noyt a race care, just my daily driver. Anyway, this upgrade bring noticeable improvement at 3000rpm+

Must Have

... oh yes, my factory ones were not cracked, just the pipe nuts were loose )



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Old 06-27-2013, 08:40 PM
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Re: 3.7 WK Headers install pics and hints

wow man, good info, glad I can contribute
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Old 06-27-2013, 08:46 PM
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Re: 3.7 WK Headers install pics and hints

actually the bolt for the y-pipe are low grade grade 5 bolt when they should be grade 8. I had the issue at first when the y-pipe and header separarted going down the road
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Old 09-23-2013, 10:41 PM
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Re: 3.7 WK Headers install pics and hints

great info definitely moved up on my mod list!!!
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Old 01-25-2014, 02:58 PM
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Re: 3.7 WK Headers install pics and hints

... some 22.000miles later







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Old 01-25-2014, 03:23 PM
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Re: 3.7 WK Headers install pics and hints

my suspect for the dammage is the insulation wrap

seems to me, there is some experience at JBA with this, see

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Old 01-25-2014, 08:07 PM
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Re: 3.7 WK Headers install pics and hints

Im running unwrapped on mine. Had to plug a hole on the right header in the collector. I suspect I cuzed it from over tightening the bolts on that side cuz I had issues with em coming out. Didn't and still no cracks like that tho....
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Old 02-11-2014, 08:22 PM
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Re: 3.7 WK Headers install pics and hints

Just wondering bro, did you repair or replace the headers yet? It may be easier to have the cracks welded shut. And more cost effective too.
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Old 02-17-2014, 04:47 AM
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Re: 3.7 WK Headers install pics and hints

I put my factory ones back. Throwed away the cracked into trash can.
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Old 02-17-2014, 04:49 AM
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Re: 3.7 WK Headers install pics and hints

Quote:
Originally Posted by LandEagle View Post
I put my factory ones back. Throwed away the cracked into trash can.
ahhhh man. I woulda welded back together for you
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Old 02-24-2014, 06:11 AM
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Re: 3.7 WK Headers install pics and hints

Quote:
Originally Posted by Strongjeff View Post
ahhhh man. I woulda welded back together for you
ahhh, man. too late for running usheaders i europe coreavelded
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Old 02-24-2014, 06:14 AM
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Re: 3.7 WK Headers install pics and hints

that suck man
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