The Mud Pit > Wrenching
TJ headpipe in a YJ
kirksjeep:
--- Quote from: BlacXJeep on August 21, 2009, 01:47:00 AM ---aww booo! you were so excited about it earlier too. I'm sure you will get the job done though.
--- End quote ---
Wosrt case I'm out $46 for a new one to replace the dented one I had, plus I'd be out $25 I paid for the TJ one.
kirksjeep:
I made more progeess today. I now have all of the pipe done except the last foot or so and the flange. It turns out the inlet to the cat is 2 1/2" but the stock YJ pipe was only 2". For my custom creation, the first 18" or so are 2" and then it transions to 2 1/2" which will flow all the way to the cat and the cat back is already 2 1/2".
kirksjeep:
--- Quote from: PaulW on August 22, 2009, 04:13:24 AM ---
I like to make mods that only a Jeep expert would notice. The pipe is going to be tucked up as high as I could make it, and will end up about an inch higher then the TJ's. Since it will be up so high no one will ever see it, but a YJ guy will notice that it's now hanging below the transmission.
It's kind of like my CB mount. I wanted to put the CB where the Ash tray/ cig lighter was, so I spent 2 days making a bracket to move the ash tray/ cig lighter under the radio and mount the CB under the heater controls. It came out so clean even YJ guys don't notice, which was the idea.
--- End quote ---
kirksjeep:
I used a 2 1/2 hold saw and drilled out the mounting flange for the 2 1/2 pipe to go into the CAT. It took a while since it was 1/4" thick steel. I got everything welded up and gave it a quick shot of header paint and went to mount it up. Everything went in ok, but the O2 sensor wont fit. There is not enough room for the sensor >:(. I tried making it fit and cracked the body of the sensor, so now I have to buy a new one and weld in a bung, plus plug up the existing hole >:(. The O2 senser that I broke was 17 years old and should probabaly be replaced anyway.
This has been a 3 day project and I'm still not done. This was much more time consuming then I ever expected, I'm just hopping it will work as planned.
kirksjeep:
I finally finished this project. I found that advance auto, and auto zone do NOT carry O2 senser bungs and Midas ( who claims to build custom exhausts) did not have any either. I found some at Bumper to Bumper across from base and they also had the plug for the stock one too ;D. I also bought some stuff from permatex that is for sealing exhaust systems and fixing cracks. It goes on like a paste but dries hard. I used some on all my welds just incase I had a pin holes.
When I took it for a test drive I noticed the Jeep doesn't have to work as hard. I couldn't feel some huge gain in power from the seat of my pants, but I didn't try to do a burn out or anything. For example, I slowed down to about 25-30 MPH to let a car in front of me turn, and I was in third gear. Normally I would have hit the gas and realized the engine was bogging down, and shifted into second. This time I stepped on the gas and the Jeep accelerated with no bogging down and I never had to shift. It almost felt like I re-geared the axles.
Now that that is done, I already started the intake manifold swap.
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