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Unread 06-03-2006, 12:22 PM   #1
wwiihistory
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Need Quick answer about TJ downpipe for YJ install

I am halfway into my exhaust manifold replacement and just read the virtualjeepclub tech post about the early TJ collector/downpipe install into a YJ for better clearance.

http://www.virtualjeepclub.com/showthread.php?t=9091

Can anyone confirm this swap and if it will clamp right up to a stock CAT with no issues. Now would be a good time for me to put one in.

Thanks

Russ

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Unread 06-03-2006, 12:56 PM   #2
TellyDSP
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IIRC, Nailer runs this setup. I believe he runs a complete TJ exhaust. May want to drop him a PM.
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Unread 06-04-2006, 10:24 AM   #3
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Check out this site http://www.tnvjc.org/
Look or ask for Bill (admin) aka Jeepsonly. He's the one that did the writeup and should be able to answer your question.
FWIW I think that once the pipe has been routed around the oil pan it will line up with the stock exhaust.
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Unread 08-10-2013, 03:51 PM   #4
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I'm in the middle of this install. I ordered a '99 manifold (Same part # for the '94), a '99 Magnaflow down pipe & Catalytic converter, and an OEM muffler. I went with the Magnaflow because it is mandrel bent and full stainless steel. Here is a link:

http://www.amazon.com/Magnaflow-2322...&vehicleType=6

Install of the manifold went really smoothly, bolted it all up no problem (Thanks to the shop who installed the previous one using anti-seize on the bolts). Went to put on the down pipe and it doesn't fit. Its bent too far such that it won't line up to the manifold without hitting the oil pain. Not to mention the flange bolt holes are too far apart to line up to the studs and it won't reach the studs anyway.

I assume the problems are stemming from the down pipe not being manufactured properly, and not a generic TJ > YJ problem? Anyone who has done this swap care to add their experience?

ETA: Looking at this stock photo on Autozone's website, it looks like the Walker down pipe has a much less shallow bend directly off the manifold than the Magnaflow one I received.



And here's the Magnaflow piece: Notice the might tighter bend.

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Unread 08-11-2013, 09:58 AM   #5
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Bump.
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Unread 08-11-2013, 10:05 AM   #6
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I used the walker downpipe on my YJ, I bolted right up without issue. I did have to use a few reducers to mate up with the flange that mates to the cat. The pipe clamps leak a little, I would weld the reducers up if I did it over again.
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Unread 08-11-2013, 10:40 AM   #7
UltimatE
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Just found another company who makes a "direct fit" down pipe & converter, made by Eastern Catalytic. We'll see if it fits. Picture looks to be mandrel bent.
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Unread 08-11-2013, 05:53 PM   #8
Louie4
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My buddy put a TJ down pipe on his '92 and I don't believe he had any issues. I'll see where he bought it.
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Unread 08-11-2013, 06:25 PM   #9
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When I did mine, I kept the 4 bolt connector that was stock on my YJ. I just had to weld on the flange to the TJ downpipe.

If yours has the slip style it should work fine. As was mentioned you may need a reducer depending on what size exhaust tubing you have in the Jeep now.

Its a good upgrade, the TJ design is routed much better
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Unread 08-11-2013, 07:00 PM   #10
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The exhaust I have in the Jeep now is just a manifold Was in the process of putting a full TJ exhaust on it when the 2nd piece stopped me dead in the water.
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Unread 08-11-2013, 07:19 PM   #11
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Gotcha, sorry didn't see where this was resurrected. I'd guess its mfg error. I used a walker pipe and it bolted right up to a yj manifold and cleared the oil pan with no issues.
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