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Unread 04-05-2013, 09:19 PM   #1
busnasty
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1990 YJ Wrangler 
 
Join Date: Nov 2011
Location: North East, MD - Maryland
Posts: 14
Headers for Yj

I have a 90 YJ with 4.2L i-6. I got a set of headers off a guy who said he was using them on an 89 Yj with same engine. He didnt know the brand. They are split headers with 2 outlets. He told me he was running dual exhaust out the back. I looked around and they appear to look like Hedman Headers for a Jeep CJ with same engine. Will these work for my YJ? I would imagine I need to run dual exhaust as well. Sorry if this question seems dumb. I am a little bit of a rookie when it comes to Jeeps.

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Unread 04-05-2013, 10:13 PM   #2
BigDub
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1989 YJ Wrangler 
 
Join Date: Jan 2013
Location: Mobile, AL
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Sounds like the Dynomax headers I have on mine
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Unread 04-06-2013, 05:59 AM   #3
busnasty
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1990 YJ Wrangler 
 
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Location: North East, MD - Maryland
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thanks. Running dual exhaust? any chance you could tell how yours is set up and what it cost to get done? thanks again.
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Unread 04-06-2013, 11:24 AM   #4
BigDub
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1989 YJ Wrangler 
 
Join Date: Jan 2013
Location: Mobile, AL
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Dual exhaust, no cat.

Headers loop around the front of the oil pan and the pipes run on both sides of the transmission over the skid plate and inside the frame. Mufflers come right after the transfer case but before the rear axle with the tailpipes looped over the rear axle and finish on either side of the rear bumper.

Headers were already installed but the mufflers and pipe installation costed $200.00.
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Unread 04-06-2013, 03:41 PM   #5
fratis
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1991 YJ Wrangler 
 
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Location: Hale'iwa, Hawai'i
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dual exhaust is a space hog on a jeep. its more of a PITA then its worth. most dual outlet headers for i6 jeeps have another collector to merge the two. this type of header uses long primary tubes and is undesirable for this application. the shorter the better. had a similar setup and it was awful.
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Unread 04-06-2013, 04:10 PM   #6
blown50
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1987 YJ Wrangler 
 
Join Date: Apr 2007
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I had the pacesetter duel set up on my4.2 before i built the stroker, mine did come with a two into one pipe, which ran under the oil pan. It was kinda a space hog but being long tube it does help on the low end torque! I have now a set for the 4.0 head that is on the stroker, just haven't had the time to install it yet. I like the duel set up, I want to put it on with a duel inlet flow master and run a single out the rear
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Unread 04-10-2013, 09:35 PM   #7
fratis
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1991 YJ Wrangler 
 
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Quote:
Originally Posted by blown50 View Post
but being long tube it does help on the low end torque!
i had a noticeably opposite effect...
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Unread 04-10-2013, 09:54 PM   #8
linusb
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1994 YJ Wrangler 
 
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Wow, 200 bucks to get all that done is a fantastic bargain. I paid 200 plus for one new muffler and piping out the back.
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