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Unread 09-29-2011, 08:50 AM   #31
NGHTJ
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So has anyone removed their cat? I have a 98 TJ that i want to do an exhaust on but i HATE cat's (the animal kind too ) and want to remove it but when i looked at it there is an O2 sensor between the cat and muffler which i dont know what to do with.....I was thinking cut exhaust pipe before cat and after muffler then remove both with 02 sensor between them and the cut O2 sensor section out and weld in after the new muffler??? would this cause problems to how the sensor reads and mess up how the engine runs?

Thanks! Nick

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Unread 09-29-2011, 09:35 AM   #32
david92xj
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Quote:
Originally Posted by NGHTJ View Post
So has anyone removed their cat? I have a 98 TJ that i want to do an exhaust on but i HATE cat's (the animal kind too ) and want to remove it but when i looked at it there is an O2 sensor between the cat and muffler which i dont know what to do with.....I was thinking cut exhaust pipe before cat and after muffler then remove both with 02 sensor between them and the cut O2 sensor section out and weld in after the new muffler??? would this cause problems to how the sensor reads and mess up how the engine runs?

Thanks! Nick
i dont have a cat, but i bought it that way. you gotta make sure its not illegal in your state. it sounds way better without it though
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Unread 09-29-2011, 09:55 AM   #33
Empty_Pockets
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Quote:
Originally Posted by NGHTJ
So has anyone removed their cat? I have a 98 TJ that i want to do an exhaust on but i HATE cat's (the animal kind too ) and want to remove it but when i looked at it there is an O2 sensor between the cat and muffler which i dont know what to do with.....I was thinking cut exhaust pipe before cat and after muffler then remove both with 02 sensor between them and the cut O2 sensor section out and weld in after the new muffler??? would this cause problems to how the sensor reads and mess up how the engine runs?

Thanks! Nick
Your going to set a check engine light...they make cat simulators that plug in where the 2nd o2 sensor goes. Or you could just weld a pipe in and tune the o2 out of the computer

Quote:
Originally Posted by david92xj

i dont have a cat, but i bought it that way. you gotta make sure its not illegal in your state. it sounds way better without it though
It's illegal in every state...federal law to have one on any vehicle 1975 model year to present.
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Unread 09-29-2011, 10:15 AM   #34
HurricaneRZA
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Yeah, mods get touchy in threads about removing the cat...
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[QUOTE=doublins;15539665]I always get people coming over and saying things like "I wish I knew how to do that," etc- but they don't realize- at some point I didn't know how to do it either- I had to figure it out.[/QUOTE]
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Unread 09-29-2011, 10:44 AM   #35
Vacabck
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I just had the high flow cat and super 44 installed yesterday on my '01 XJ. Sounds a lot better than it did, but I am a bit underwhelmed. Do these "break in" over time? Would a 2 1/2" exhaust make that big of a difference over a 2 1/4?
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Unread 09-29-2011, 10:59 AM   #36
david92xj
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Quote:
Originally Posted by Empty_Pockets View Post
It's illegal in every state...federal law to have one on any vehicle 1975 model year to present.
in michigan they dont have emissions testing and they dont enforce that law, unless your vehicle is rediculously loud, they would tell you to get a new muffler
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Unread 09-29-2011, 11:18 AM   #37
Empty_Pockets
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Quote:
Originally Posted by david92xj

in michigan they dont have emissions testing and they dont enforce that law, unless your vehicle is rediculously loud, they would tell you to get a new muffler
Still dosent change the fact that the cop can give u a pretty hefty ticket for it.
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Unread 09-29-2011, 12:29 PM   #38
NGHTJ
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ok so then i will leave it on.....

thanks
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Unread 09-29-2011, 12:59 PM   #39
david92xj
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Originally Posted by Empty_Pockets View Post
Still dosent change the fact that the cop can give u a pretty hefty ticket for it.
well even if that happened, it didnt have one when i bought it, so if a cop has a problem with it then they can buy the cat for me.
i only know one person who ever got pulled over around here for a loud vehicle and he didnt even get a ticket. they just told him he needed a quieter muffler
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Unread 09-29-2011, 02:11 PM   #40
HurricaneRZA
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Quote:
Originally Posted by david92xj View Post
well even if that happened, it didnt have one when i bought it, so if a cop has a problem with it then they can buy the cat for me.
i only know one person who ever got pulled over around here for a loud vehicle and he didnt even get a ticket. they just told him he needed a quieter muffler
You're probably already aware, regardless of your vehicle's condition it's your responsibility to make it roadworthy not the cop who pulls you over.

You'd probably get away with it if that's what you were asking, but it's people cutting corners on their rigs which give the hippies the ammo they need to get stricter regulations...
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Unread 09-29-2011, 07:16 PM   #41
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Quote:
Originally Posted by HurricaneRZA View Post
You're probably already aware, regardless of your vehicle's condition it's your responsibility to make it roadworthy not the cop who pulls you over.

You'd probably get away with it if that's what you were asking, but it's people cutting corners on their rigs which give the hippies the ammo they need to get stricter regulations...
x2. Its also kind of selfish to take your cat off. Your exhaust might be louder but you are also leaving a fume trail for the car behind you.

Also, telling a cop that your vehicle came without a cat so its not your problem almost guarantees you a ticket or fine. Ignorance is never a good excuse.
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Unread 09-29-2011, 09:03 PM   #42
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Quote:
Originally Posted by jeepkid03 View Post
x2. Its also kind of selfish to take your cat off. Your exhaust might be louder but you are also leaving a fume trail for the car behind you.

Also, telling a cop that your vehicle came without a cat so its not your problem almost guarantees you a ticket or fine. Ignorance is never a good excuse.
You can't really call me selfish if I never messed with it.
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Unread 09-30-2011, 10:06 AM   #43
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Quote:
Originally Posted by david92xj View Post
You can't really call me selfish if I never messed with it.
I wasn't talking to you specifically, but you certainly ARE aware that its supposed to be there and that it doesn't have one. I'm not saying its your fault it didn't come with one, but blaming the previous owner for why it doesn't have one now is kind of silly.

You aren't really helping yourself either though, since you are breathing in the fumes as well. A louder "look at me" exhaust isn't really a good trade off don't ya think? For what its worth they make "racing" and high flow spun cats that flow really well. There is a forum floating around (tuner forum maybe?) that did a sound test between a "test pipe" where the cat was and a high flow cat and there was almost no difference. The cat even made the exhaust sound a tad deeper since it acts as a resonator. These can be had for fairly cheap on ebay. I'm not a tree hugger, but I hate when I'm following a car that has no cat and is spreading fumes to those behind it. Other drivers on the road are considerate of those behind them and run cats on their vehicles.
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Unread 09-30-2011, 10:39 AM   #44
david92xj
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Originally Posted by jeepkid03 View Post
I wasn't talking to you specifically, but you certainly ARE aware that its supposed to be there and that it doesn't have one. I'm not saying its your fault it didn't come with one, but blaming the previous owner for why it doesn't have one now is kind of silly.

You aren't really helping yourself either though, since you are breathing in the fumes as well. A louder "look at me" exhaust isn't really a good trade off don't ya think? For what its worth they make "racing" and high flow spun cats that flow really well. There is a forum floating around (tuner forum maybe?) that did a sound test between a "test pipe" where the cat was and a high flow cat and there was almost no difference. The cat even made the exhaust sound a tad deeper since it acts as a resonator. These can be had for fairly cheap on ebay. I'm not a tree hugger, but I hate when I'm following a car that has no cat and is spreading fumes to those behind it. Other drivers on the road are considerate of those behind them and run cats on their vehicles.
I know what you mean and you probably think im the guy running no cat and a flowmaster 10, but the point is I put a dynomax super turbo on it and unless I have the pedal to the floor it barely sounds different then stock and it isn't loud at all
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Unread 09-30-2011, 11:17 AM   #45
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I love me some flowmaster pipes!
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