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Old 03-26-2012, 10:54 PM   #1
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How to tell if you need new Cat.???

I am looking at replacing the exhaust on my 2.5. It sounds real crappy and wore out. Looking at ordering this.

http://www.wranglerforum.com/f5/new-...ed-148199.html

Question is.... How do you tell if the cat is wore out? I don't want to order exhaust and it not sound any better because the crappy sound is coming from the cat. I had rather just order new cat too. Is there any way to tell.

Will a system improve the sound of the 2.5 or is that just the way they are going to sound. I have heard 4 cylinders that people have tried to run straight pipe or glass packs on and to me they sound worse. I don't mind a low rumble but nothing loud.

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1997 TJ Zone 4.25 combo, 33x12.50x15 BFG T/A-KO
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Old 03-26-2012, 11:16 PM   #2
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The computer will tell you when the cats bad. Or the incessant rattling from the separated core will inform you!

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Old 03-26-2012, 11:26 PM   #3
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Quote:
Originally Posted by DevilDogDoc View Post
The computer will tell you when the cats bad. Or the incessant rattling from the separated core will inform you!
Thanks. The computer showing nothing. It does have a rattling sound. The exhaust on it is old and so is the muffler. So I thought the sound might be coming from muffler.
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2003 TJ.Zone 3" lift, JKS 1.25 body lift and mml,33x12.50x15 Duratracs, Ace rails, KC lights.

2010 JKU 1.25 body lift, OME HD lift, JKS tracbars, AEV geometry brackets, Dick Cepek Torque wheels, 315/70/17 Duratracs

1997 TJ Zone 4.25 combo, 33x12.50x15 BFG T/A-KO
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Old 03-26-2012, 11:29 PM   #4
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I needed a new one when he got hit out on hwy. I had him stuffed and mounted with that 'deer in the headlights' look on his face...He's been source of endless laffs ever since I'll just keep him and forego a new one.

Oh...You mean the converter? What he ^ said.
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Old 03-26-2012, 11:33 PM   #5
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I have a'04 TJ that because of my stupidity (TJs don't like premium fuel) started eating cats.....replaced the factory cat (out of warranty) and within 6 months no power couldn't get RPMs above 3K, replaced second cat (first aftermarket) and within 6 months same thing again.

However during the time in between I found out about this Forum, and premium fuel, and the shop got tired of replacing the Cat so ordered a "High Flow" cat and installed under warranty.

That was about 18 months or 2 years ago, this cat still working great, plenty of power, no complaints.

Oh and just for everyone's info....LIL RED never threw a code for the cat.
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Old 03-26-2012, 11:38 PM   #6
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JP, which highflow cat you talking about??
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2003 TJ.Zone 3" lift, JKS 1.25 body lift and mml,33x12.50x15 Duratracs, Ace rails, KC lights.

2010 JKU 1.25 body lift, OME HD lift, JKS tracbars, AEV geometry brackets, Dick Cepek Torque wheels, 315/70/17 Duratracs

1997 TJ Zone 4.25 combo, 33x12.50x15 BFG T/A-KO
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Old 03-26-2012, 11:48 PM   #7
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I can't say for Positive but the shop I went to was midas..and everything else we installed was Flowmaster...I get a lot of complements on the sound.

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