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Old 04-14-2013, 09:25 PM   #1
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YJ Exhaust upgrade

Hey y'all, the bracket for the old stock exhaust on my 94 YJ broke awhile back and the pipes rubbed against the drive shaft causing holes, and abrasions on the drive shaft. So I will be replacing the old exhaust and manifold(has a small crack just before the coupling) and was wondering if anyone had any advice as far as which one to get. I am looking to boost my performance as well as mileage without going too expensive. Where the vehicle is registered it is a non emissions county so I will not be running a cat. Thank you and remember to Keep Calm, Jeep On!!!!

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Old 04-16-2013, 11:22 AM   #2
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Get one of the exhaust manifolds with the stress relief (springy looking thing) on the pipe. If you omit the cat, the fumes will stink as you drive around with the back open. Route the end of the exhaust toward the drivers side to help with that, but I would keep the cat for that purpose

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Old 04-16-2013, 03:05 PM   #3
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no advice, but I can tell you one thing...

When my connection came loose at the pipe to manifold spot (where the donut gasket is) it caused my pipe to swing over and rub the front shaft.

Upon tightening up the donut there at the back of the manifold, I how have a ton of clearance again without any chance of rubbing.

Any chance to weld the small crack, tighten 'er down and be done super easy? Just thinkin...
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Old 04-16-2013, 03:14 PM   #4
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Banks!! I cheaped out and did a magnaflow exhaust. It's a little loud for my taste. A friend had a flow master 40 on his and was a bit nicer than mine.
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Old 04-16-2013, 06:34 PM   #5
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I put a longblock 2.5 in mine ,the old manifold was cracked so I put a header on it.It came w/that piece of pipe that bolted right up to my old cat...russ
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Old 04-16-2013, 07:43 PM   #6
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I put a pace setter header on mine and then cut the cat and ran a straight pipe to a flow master super 44 series muffler and I love it. It sounds awesome
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Old 04-16-2013, 07:52 PM   #7
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Just another heads up when you replace your manifold be sure to do it from above and unhook your intake also. Your gasket covers the intake also. I ended up taking it out from the bottom and all which was a pain anyways having to disconnect the driveshaft and motor mount. Just to slide the new one in. Then I cut the gasket to make it easier to slide in but once I put it back together and started it.., it held wide open. Found out it was getting too much air so you have to remove the fuel rail on top and all that to go about it. Just trying to save you some trouble I had. Lol
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Old 04-17-2013, 10:19 AM   #8
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Quote:
Originally Posted by CCFD View Post
Hey y'all, the bracket for the old stock exhaust on my 94 YJ broke awhile back and the pipes rubbed against the drive shaft causing holes, and abrasions on the drive shaft. So I will be replacing the old exhaust and manifold(has a small crack just before the coupling) and was wondering if anyone had any advice as far as which one to get. I am looking to boost my performance as well as mileage without going too expensive. Where the vehicle is registered it is a non emissions county so I will not be running a cat. Thank you and remember to Keep Calm, Jeep On!!!!

This is my plan for my exhaust maybe you will like it for your jeep. Ill be getting a new exhaust manifold with the (spring looking things). Get a TJ down pipe routed in front of my oil pan have my cat welded to the pipe then getting a flow master super 40 and have it dump down before reaching the rear axle.
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Old 09-25-2013, 03:58 PM   #9
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We just did a YJ 2.5 and deleted cat. The flange at the head pipe has enough rotation that it will tighten down and seal away from the front driveshaft properly. I replaced the head pipe, took a straight piece of 2.25 pipe to a flow-master super 44. In reading the threads fm super 44 highly recommended. Also was shared many times it sounds best with at least 1.5 ft of tailpipe. Sooo New head pipe, str8 pipe, fm super 44, and stock tailpipe. I bought the head pipe and tailpipe, ordered the fm to fit and no adapters!! yay! Sounds great, deep tone, not ricey, no fumes in jeep, kind of loud for my tastes but the boy loves it.
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Old 09-25-2013, 04:11 PM   #10
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I'm going to delete my cat and straight pipe it with a cherry bomb glass pack.
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Old 09-25-2013, 06:57 PM   #11
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I did a flowmaster 40 series on mine with duels it sounds pretty good! I get lots of compliments on it it also has no cat here's a link to a video sounds better now that it's broke in
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Old 09-25-2013, 07:12 PM   #12
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I put a stock cat and muffler on mine because I couldn't afford performance a couple of months ago. To me it sounds plenty loud and if it were any louder it would be annoying. It still drowns out any video I take. I have a 4.2 though and I'm not sure the difference in the 4.2 and 4.0 volumes.

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