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Old 06-19-2017, 02:37 AM
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Mandrel bent stainless head pipe for 4.0?

I put a Doug Thorley header and a Borla cat back and removed the cat from my 4.0 but i never got around to doing anything about the head pipe. I know there wont be a whole lot of power gained from replacing it which is part of the reason i never did it. But the jeeps older now and its either caked in mud or its rusting or both. I never liked the cheap walker head pipes with the crappy bends in them. But i thought i would start shopping for one and to my surprise i cant find any. I was pretty sure Banks used to make one but they no longer list it on their website. Either that or im thinking about a different company that used to make one.

I did come across YJ guys using TJ pipes because it is routed in front of the oil pan to keep from crushing the pipe offroad. So i am looking to see what Stainless pipes are available for the TJ. The only problem i see with this mod is the O2 sensor bung is on the back side and im not sure if the YJ's wiring will reach that far. Is anyone running a TJ pipe on a YJ and did the O2 sensor wiring reach?

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Old 06-19-2017, 08:30 AM   #2
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I'm running the Magnaflow head pipe and cat from a 97-99 TJ. O2 wiring fits just fine.
Pics here in post #2.
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Old 06-19-2017, 09:06 AM   #3
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I had my own made..the header on my 4.2 is split..have 2 pipes come from header down around front of oil pan and then the go back to rest of exhaust...seems you could just length the wire on the O2 sensor...I got rid of it with my computer and carter steper carb...so I didn't have worry about putting it back in..you fellas with your high tech FI....
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Old 06-19-2017, 11:54 AM
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Quote:
Originally Posted by Airslot View Post
I'm running the Magnaflow head pipe and cat from a 97-99 TJ. O2 wiring fits just fine.
Pics here in post #2.

Nice! I don't need the cat though i will call magnaflow and see if they will just sell me the head pipe.
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Old 03-27-2018, 02:15 PM
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Update

I accidentally found this pipe i had been looking for last night. I thought it was made by Banks But it is made by JBA and the part number is 1526SY it's stainless and mandrel bent and routed in front of the oil pan like the TJ to keep it from getting smashed. I thought it was out of production but it is now in my to buy list

https://www.summitracing.com/parts/JBA-1526SY/

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Old 03-28-2018, 01:26 AM   #6
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Very nice!
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Old 03-28-2018, 07:37 AM   #7
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Haha nice!!! I am going to get one too!!!
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Old 03-28-2018, 06:10 PM
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I ordered it because i have wanted it for years and thought it was out of production. But i wont get to install it for a while because i plan on replacing my rear main seal and while i was in there i was going to throw a new timing chain on it. As well and i may even put a new Milling oil pump on it as preventive maintenance and a ironman4x4fab oil pan skid

And if i put it on now id have to remove it again later and i don't want to fight with it. So im going to buy all the parts i need Cloyes double roller, Milling oil pump, Felpro rear main seal, and ironman4x4fab skid and just do it all one weekend when the weather gets warmer.

I wonder if i should put exhaust wrap on this pipe though since it runs around the oil pan so closely?
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Old 03-28-2018, 10:11 PM   #9
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I wonder if i should put exhaust wrap on this pipe though since it runs around the oil pan so closely?
I did. That's a lot of heat to pump into the pan, especially when running slow.
It also puts heat into the starter.
Header wrap and stainless steel ties to hold it in place.
Mine's been on there almost two years with no problems.
Take another look at my previous link above.
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Old 03-28-2018, 10:30 PM
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Originally Posted by Airslot View Post
I did. That's a lot of heat to pump into the pan, especially when running slow.
It also puts heat into the starter.
Header wrap and stainless steel ties to hold it in place.
Mine's been on there almost two years with no problems.
Take another look at my previous link above.

I did lol i forgot it was your link i seen the wrap on though (been searching google a lot). But yeah that seems like a good idea, I don't have to worry about it getting wet and rusting the exhaust because it's stainless so there is no excuse not to do it except for there being one more thing to buy.

The low hanging mid pipe has always irked me i don't know why jeep didn't rout it like the TJ to begin with.
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Old 03-29-2018, 12:41 AM   #11
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Fwiw my tj w the same style pipe (factory) and over 200,000 miles shows no ill effects from heat
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Old 03-30-2018, 01:16 AM   #12
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Well mine is on the way... my local parts store manager got it for me for $116 after tax...

With my banks cat back system this makes my whole exhaust mandrel bent stainless... will be replacing the banks muffler w a walker quiet ss
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TJ dash speakers that actually rock! Kicker sub and amp in center console
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Old 03-31-2018, 02:35 AM
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I got my JBA mid-pipe today from Summit, it looks good quality heavy wall tube seems thicker than the stocker. There is 3 sections that are welded together and it looks cleanly done but there looked to be a lot of loose slag and metal shavings in the pipe. I didn't want it ending up in my Borla so i ran a piece of rope though it and tied a old rag and swabbed it out. There was a surprising amount of metal so im glad i took the time to do it if your running a cat i really wouldn't want it plugging it up so you might want to do the same.
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Old 03-31-2018, 08:46 AM   #14
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I have the same JBA mid-pipe on my YJ. Sounds great.
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Old 06-04-2018, 06:16 PM   #15
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I saw your post about the JBA Exhaust. Will this fit a 1987 YJ 4.2l? I know JBA says 1991 and up. I also called JBA Tech support but your post intrigued me. Was hoping someone else is running this in a 4.2l
Any feed back would be greatly appreciated.
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Old 06-04-2018, 06:57 PM
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Originally Posted by WOODMAN4 View Post
I saw your post about the JBA Exhaust. Will this fit a 1987 YJ 4.2l? I know JBA says 1991 and up. I also called JBA Tech support but your post intrigued me. Was hoping someone else is running this in a 4.2l
Any feed back would be greatly appreciated.

I don't know, i suppose if the collector dumps at the same spot and same angle it should work but you still have a O2 sensor bung you would have to plug. I think the 258 had a cast manifold though

I just started putting the JBA pipe on mine. I been putting it off because i didnt want to have to remove it to get the oil pan off the change my rear main seal. But now that it's done I'm working on putting the JBA pipe on.

I don't like how the pipe wraps around the oil pan sump and heats it up so i bought a 25 foot roll of DEI titanium wrap. I am going to wrap the pipe and according to the wrap calculator i should have enough to do from the O2 sensor up to the starter to help keep it cool too.

Right now I'm just test fitting it but i love how it no longer hangs down under the bell housing begging to be smashed off road.


Edit: i just looked up pictures of the 258 exhaust manifold it's not at all like the 4.0 exhaust manifold


258




4.0
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Old 06-05-2018, 07:50 PM
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I got the JBA pipe put on today just to make sure everything fit before i tried to wrap it in header wrap and find out i had a problem. And the skid plate mount is WAY off by over a inch and the only way to make it fit is to cut it off and re-weld it.

Since i am running a NV4500 transmission the mount is no longer built into my tranny mount so this could be part of the problem but i don't really think so. But overall the fit isn't too bad nothing is perfect.

I made a mount that bolted to the skid using the old mount i cut off the tranny old AX15 tranny mount but i never used it. It's been fine for years with no mount there and even though i was planning on putting it back on since i was doing exhaust work i think I'm going to cut the mount off the exhaust pipe and run without it.

The bad is my exhaust no longer sound the same. The old pipe was in good shape no holes and it sounded good. I didn't expect the tone of the exhaust to change but it did and i don't like it. But at least the pipe up off the ground and out of the way.
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Old 06-07-2018, 05:12 PM
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I wrapped the JBA pipe in DEI titanium wrap. the stainless ties that come with the wrap are too short to use so i used 2-1/2" stainless hose clamps. I drove it and got it up to operating temp and after cooling down it feels kinda crunchy. I hope this is not a bad sign of it already getting brittle, if it starts falling off i will come back and post about it. Seems like it's doing it's job though.

I did this much pipe with a roll of 2" wide 25 foot long wrap using 1/4" overlap. It was enough to do from abut 1" past the flange to past the starter and under the bell housing so it should keep the starter cooler too.

Also, the flange bolts for the header were too short so i had to buy longer ones. The ones i had on there were 3/8" grade 5 and rusted but came off easy. I thought i would put stainless bolts so they would be easier to remove in the future. So i put 2 new stainless bolts and nuts on it and drove the jeep twice. When i took the pipe back off to put the wrap on and mess with the rear mount one of the stainless bolts seized. It was seized so bad i ended up twisting the bolt in half. Stainless fasteners do not seem to like heat so i put grade 5's back in it.
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Old 03-31-2019, 09:42 AM   #19
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If using the 97-99 TJ front pipe/cat section will I also need the 97-99 TJ cat back exhaust or stay with the 91-95 YJ exhaust cat back? Looks like the 91-95 YJ cat is a flange.
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Old 03-31-2019, 02:12 PM   #20
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If using the 97-99 TJ front pipe/cat section will I also need the 97-99 TJ cat back exhaust or stay with the 91-95 YJ exhaust cat back? Looks like the 91-95 YJ cat is a flange.
Read through this before buying the 97-99 TJ front pipe.
Welcome to LIEBLWEB.com! TJ exhaust on a YJ

And I will never use header wrap....
https://www.centuryperformance.com/e...o-not-use.html
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Old 03-31-2019, 03:37 PM   #21
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Originally Posted by Airslot View Post
I'm running the Magnaflow head pipe and cat from a 97-99 TJ. O2 wiring fits just fine.
Pics here in post #2.

He says the magnaflow headpipe TJ and cat fits his YJ.

Got one one order for 200$ shipped.


The link below is for a generic or unknown brand of head pipe.


Quote:
Originally Posted by JonStevens View Post
Read through this before buying the 97-99 TJ front pipe.
Welcome to LIEBLWEB.com! TJ exhaust on a YJ

And I will need use header wrap....
https://www.centuryperformance.com/e...o-not-use.html
If it test fits up, then I will send it off for ceramic coating.
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Old 03-31-2019, 03:58 PM   #22
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^^^^
Ok, I misunderstood.
The JBA 1526SY is not a 97-99 TJ front pipe, it is designed for the YJ.

And I said “I will need use header wrap” and I changed that to “never use header wrap”.
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Old 03-31-2019, 07:23 PM   #23
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^^^^
Ok, I misunderstood.
The JBA 1526SY is not a 97-99 TJ front pipe, it is designed for the YJ.

.
The JBA looks just like a TJ front pipe minus the Cat.

https://shop.jbaheaders.com/jba-perf...-wrangler.html

The first link you provided was for a factory TJ pipe.
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Old 04-01-2019, 05:23 PM
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From what i have seen TJ pipes can be made to work but they are slightly "off" and need adjustment. The JBA pipe is made to fit the YJ and bolts up without any tweaking of anything.
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Old 04-01-2019, 10:04 PM   #25
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Correct... I've had both.... tj pipe doesn't fit quite right and needs bent some...
Jba pipe is a perfect fitting mandrel bent thing of beauty.
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Old 04-02-2019, 09:39 AM   #26
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I could not find it listed anywhere, but is the JBA midpipe only for the 4.0 or would it work with the 2.5?
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Old 04-07-2019, 12:11 PM   #27
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Correct... I've had both.... tj pipe doesn't fit quite right and needs bent some...
Jba pipe is a perfect fitting mandrel bent thing of beauty.
Have you tried the Magnaflow TJ pipe?
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Old 04-07-2019, 02:05 PM   #28
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Nope.... that said, if it fits a tj it doesn't properly fit a yj... they are different
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Old 04-07-2019, 06:34 PM   #29
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Nope.... that said, if it fits a tj it doesn't properly fit a yj... they are different
Hope to take a few days off work this week and get some chores done. I hope to measure and then test fit the magnaflow TJ pipe on the YJ. At least three other forum members reported that the pipe fit.
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Old 04-07-2019, 08:41 PM   #30
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Don't get me wrong... it can be easily made to fit... just not a direct bolt up to stock exhaust....

On the walker pipe I used, I bolted it up and put my foot on it while holding the frame and bent it.... then it didn't have the hanger bracket that hooks up at the trans mount so that needed attention...

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TJ dash speakers that actually rock! Kicker sub and amp in center console
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