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Unread 07-05-2013, 10:26 PM   #1
JayRay08
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Header swap (true or false)???

I read somewhere that a good exhaust header swap as an upgrade to the 318 5.2 v8 zj would be headers from 92-93 dodge trucks, vans, dakotas as well as the 93 ZJ. anyone have knowledge of this? would this be a good cheap upgrade if pulled from a salvage yard??

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Unread 07-05-2013, 10:28 PM   #2
dnuccio
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no. any exhaust manifold from a full size dodge anything is going to dump straight into the "frame" rail of the ZJ.
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Unread 07-05-2013, 10:57 PM   #3
JayRay08
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Ok so the only upgrade to the exhaust would be a new cat and a performance muffler. This is my first time messing with exhaust. Would i want 2.5 inch pipe from the manifold to the cat? Would that also mean i am looking for a 2.5 inch inlet and outlet for the cat and muffler? sorry for the noob question.
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Unread 07-05-2013, 11:21 PM   #4
Mickey_D
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Talk to Kolak. He's a member on here as well as one hell of a vendor.
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Unread 07-06-2013, 10:16 AM   #5
HighLonesome
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Some stock 93 ZJ V8 exhaust manifolds are supposed to flow better. I have no idea how to spot them or how much better they are. speedfreaks.net has some info.
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Unread 07-06-2013, 10:27 AM   #6
Pierre_r
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I bought the doug thorley headers from kolak.
They are a litte pricey but if you want to go 3" all the way they are worth it according to all of those who have them on their jeeps. + they look much nicer than the stock manifolds...
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Unread 07-31-2013, 09:36 PM   #7
JayRay08
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any thoughts on these http://www.jegs.com/i/Hedman/500/785...d=#moreDetails
or another brand that wold work well?
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Unread 07-31-2013, 09:53 PM   #8
dnuccio
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you cant just find headers for a 318/360. they need to be specifically designed for a ZJ. most if not all aftermarket headers (that arent designed specifically for the ZJ) dump right into the ZJs frame rail
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Unread 07-31-2013, 09:57 PM   #9
JayRay08
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I was reading thru ratmonkeys thread and thought he had used those..
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Unread 07-31-2013, 10:00 PM   #10
dnuccio
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he mightve. i dont know for sure
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Unread 07-31-2013, 11:11 PM   #11
newfieZJ
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Quote:
Originally Posted by JayRay08 View Post
I was reading thru ratmonkeys thread and thought he had used those..
He did but had no choice . His trans swap was from a Dodge putting the starter on the driver's side . This was his only option and if Kolak sold out the last batch of Thorley's , our only option .

With them , comes the fabrication of the y-pipe . Can get pricey if you can't do it yourself

I have headers and love them , but , from now on , I will have to be content with making a new y-pipe with 2.5 pipe and no crush on the pass side (tight) . Supposedly , removing the crushed pipe adds approx 10 hp alone , probably 10+ more with bigger y-pipe . That will be close to header capability .

Biggest gain comes from a new cat and muffler . 2.5" works fine unless you have headers or modify the y-pipe .

IIRC , the 93's had a larger outlet on the manifold .25" bigger . Early production only . Hard to spot like you said HL , hard to find period .
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Unread 07-31-2013, 11:15 PM   #12
StPaul59
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Some Dakota shorty headers will work. Ratmonkey was using them I think.
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Unread 08-01-2013, 10:21 AM   #13
JayRay08
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thanks for clarifying that newfieZJ. Ive read people throwing around edelbrock having some but I haven't found em yet. do you know if they still make them and if so can you link it here?
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Unread 08-01-2013, 10:31 AM   #14
newfieZJ
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Edlebrock stopped making the some time ago . I have them , they are very good . No issues since the install . only a 2.5 collector but they work well . I got them for $250 delivered to my door under a 1/2 hour , 2nd hand but new . Guy needed some $$$

Post 26 has a pic of the complete Edlbrock kit
http://www.jeepforum.com/forum/f197/...86/index2.html
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Unread 08-01-2013, 11:52 AM   #15
CatSplat
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Quote:
Originally Posted by StPaul59 View Post
Some Dakota shorty headers will work. Ratmonkey was using them I think.
IIRC he had to notch his frame to make those ones fit.
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