Removed cats?
Drifting
Joined: Sep 2005
Posts: 1,371
Likes: 2
From: Gilbert AZ
Sucks my car is a track only car and I bought a cat'd x pipe just for testing. My car smells like gas, my house smells like gas everytime i start the car. You smell for hours.. Just sucks 
Put hi-flow cats on.
Put hi-flow cats on.
Le Mans Master
Joined: Oct 1999
Posts: 8,205
Likes: 40
From: Tucson AZ
I called the exhaust shop and they told me they would remove that cats, but they don't encourage do it because it takes away performance. (Because of backpressure) And it makes the computer system go haywire and cause a check engine? On top of that he even told me it will make the car sound like crap. I'm starting to think twice about doing this.
Drifting
Joined: Jan 2000
Posts: 1,660
Likes: 9
From: Charlotte, NC
Just to clarify what others have posted: Yes, it is a federal offense for the exhaust shop to remove any emission related item. It is also a federal offense if you do it yourself. 
There is just no logical reason to do this on a street car. The sound is brash and untuned, you stink where ever you go, your rear O2 sensors are going to light up your DIC like a Christmas tree, and there is very little performance to be had over high-flow cats. If you didn't already know these aforementioned characteristics, then you shouldn't be messing with the cats.
Stock performance would be down because the car was built and engineered to run with catalytic converters. On a modified car, there may be some gains to be had, but very minimal.
I really don't understand why on this site we are not allowed to discuss street racing but yet we're allowed to freely discuss the best way to commit federal offenses.
There is just no logical reason to do this on a street car. The sound is brash and untuned, you stink where ever you go, your rear O2 sensors are going to light up your DIC like a Christmas tree, and there is very little performance to be had over high-flow cats. If you didn't already know these aforementioned characteristics, then you shouldn't be messing with the cats.
Stock performance would be down because the car was built and engineered to run with catalytic converters. On a modified car, there may be some gains to be had, but very minimal.
I really don't understand why on this site we are not allowed to discuss street racing but yet we're allowed to freely discuss the best way to commit federal offenses.
Drifting
Joined: Sep 2005
Posts: 1,371
Likes: 2
From: Gilbert AZ
Just to clarify what others have posted: Yes, it is a federal offense for the exhaust shop to remove any emission related item. It is also a federal offense if you do it yourself.
There is just no logical reason to do this on a street car. The sound is brash and untuned, you stink where ever you go, your rear O2 sensors are going to light up your DIC like a Christmas tree, and there is very little performance to be had over high-flow cats. If you didn't already know these aforementioned characteristics, then you shouldn't be messing with the cats.
Stock performance would be down because the car was built and engineered to run with catalytic converters. On a modified car, there may be some gains to be had, but very minimal.
I really don't understand why on this site we are not allowed to discuss street racing but yet we're allowed to freely discuss the best way to commit federal offenses.
There is just no logical reason to do this on a street car. The sound is brash and untuned, you stink where ever you go, your rear O2 sensors are going to light up your DIC like a Christmas tree, and there is very little performance to be had over high-flow cats. If you didn't already know these aforementioned characteristics, then you shouldn't be messing with the cats.
Stock performance would be down because the car was built and engineered to run with catalytic converters. On a modified car, there may be some gains to be had, but very minimal.
I really don't understand why on this site we are not allowed to discuss street racing but yet we're allowed to freely discuss the best way to commit federal offenses.
Burning Brakes
Joined: Jun 2007
Posts: 878
Likes: 144
From: Little Egypt, USA
I really don't understand why on this site we are not allowed to discuss street racing but yet we're allowed to freely discuss the best way to commit federal offenses.
That means no discussion on this forum of changing cold air intakes, MAF's, intake manifolds, headers with or without cats, Z06 exhaust manifolds on LS2's, heads, cams, injectors, adding superchargers or turbos, etc and a Tune of any kind.
The forum would have to reject half or its sponsors and advertising.
It would become really boring around here. The more interesting threads would be "I'm picking my new vette up on Friday" or "I just put my second coat of Rejex on" or "My nav disc does not show my house"
Since the first car rolled off the assy line hot rodders have been modifying them. A rarely enforced/prosecuted law on private citizens will not stop it. Even in states with testing people cheat, some to the extent of reinstalling stock parts for the test and then putting the mods back on as soon as they get home.
Many vette owners on this forum are hot rodders and will be till the day they can no longer pick up a wrench or the government goes house to house confiscating illegal vehicles.
My advise is get used to it.
Last edited by wbear; Feb 26, 2008 at 05:30 PM.
Pro
Joined: Oct 2003
Posts: 639
Likes: 0
From: springfield missouri
just tune it to disable the o2s. cut the cats at factory welds. shove pipe through them. Weld back up at factory welds. Its real easy and looks stock. No codes. If you don't like broken laws, don't ever exceed the speed limit in your car. Don't pee in public. Don't tear the label off your mattress. Pay your taxes on time. Don't have two glasses of wine at dinner and drive home. In fact, vote for some more laws so that we become even further from being the land of the free that we proclaim that we are. I need another stop light right by my house. Can you help me out?
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Instructor
Joined: Nov 2007
Posts: 126
Likes: 0
From: Rancho Santa Margarita California
In California, they set up these like smog check points on freeway on ramps ect with a camera and 5 gas. If you roll buy this thing with no cats they will bust you. I was told if a cop sees you have removed any smog devices removed they can actually impound your car.
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 898
Likes: 0
From: Oklahoma
Why just pick on cats. You should mention that ANY modification to an emission related component is the same felony.
That means no discussion on this forum of changing cold air intakes, MAF's, intake manifolds, headers with or without cats, Z06 exhaust manifolds on LS2's, heads, cams, injectors, adding superchargers or turbos, etc and a Tune of any kind.
The forum would have to reject half or its sponsors and advertising.
It would become really boring around here. The more interesting threads would be "I'm picking my new vette up on Friday" or "I just put my second coat of Rejex on" or "My nav disc does not show my house"
Since the first car rolled off the assy line hot rodders have been modifying them. A rarely enforced/prosecuted law on private citizens will not stop it. Even in states with testing people cheat, some to the extent of reinstalling stock parts for the test and then putting the mods back on as soon as they get home.
Many vette owners on this forum are hot rodders and will be till the day they can no longer pick up a wrench or the government goes house to house confiscating illegal vehicles.
My advise is get used to it.
That means no discussion on this forum of changing cold air intakes, MAF's, intake manifolds, headers with or without cats, Z06 exhaust manifolds on LS2's, heads, cams, injectors, adding superchargers or turbos, etc and a Tune of any kind.
The forum would have to reject half or its sponsors and advertising.
It would become really boring around here. The more interesting threads would be "I'm picking my new vette up on Friday" or "I just put my second coat of Rejex on" or "My nav disc does not show my house"
Since the first car rolled off the assy line hot rodders have been modifying them. A rarely enforced/prosecuted law on private citizens will not stop it. Even in states with testing people cheat, some to the extent of reinstalling stock parts for the test and then putting the mods back on as soon as they get home.
Many vette owners on this forum are hot rodders and will be till the day they can no longer pick up a wrench or the government goes house to house confiscating illegal vehicles.
My advise is get used to it.
For the sake of smelling good for a date everytime I don't think I'll be cutting out the cats. The magnaflow mufflers I had were also "an alteration to emissions". But I've stopped and talked to many police officers and they said as long as it doesn't sound like s*** they have no problems with aftermarket exhausts. But if a LEO wants to give you a ticket for something, he'll give you a ticket regardless of what type of exhaust you have.
Burning Brakes
Joined: Jun 2007
Posts: 878
Likes: 144
From: Little Egypt, USA
In California, they set up these like smog check points on freeway on ramps ect with a camera and 5 gas. If you roll buy this thing with no cats they will bust you. I was told if a cop sees you have removed any smog devices removed they can actually impound your car.
Pro
Joined: Mar 2006
Posts: 658
Likes: 0
From: Pa
I run without cats (and without mufflers or resonators either) and when I had no cats and a b and b exhaust that baby was loud. My car stunk of gasoline if you got behind it before. Now with straight pipes I have had people say that my exhaust has made their eyes cry.
To answer your original question: No you will never pass emmisons, yes they will stink but it wont bother you after awile personally I like the smell. You might even shoot a flame or two when you shift I did when all I had was resonators and my afr ratio's are all normal.
To answer your original question: No you will never pass emmisons, yes they will stink but it wont bother you after awile personally I like the smell. You might even shoot a flame or two when you shift I did when all I had was resonators and my afr ratio's are all normal.
no cats...exhaust smell is a little worse and the flames are cool at night.
Pro
Joined: Mar 2006
Posts: 658
Likes: 0
From: Pa
Why just pick on cats. You should mention that ANY modification to an emission related component is the same felony.
That means no discussion on this forum of changing cold air intakes, MAF's, intake manifolds, headers with or without cats, Z06 exhaust manifolds on LS2's, heads, cams, injectors, adding superchargers or turbos, etc and a Tune of any kind.
The forum would have to reject half or its sponsors and advertising.
It would become really boring around here. The more interesting threads would be "I'm picking my new vette up on Friday" or "I just put my second coat of Rejex on" or "My nav disc does not show my house"
Since the first car rolled off the assy line hot rodders have been modifying them. A rarely enforced/prosecuted law on private citizens will not stop it. Even in states with testing people cheat, some to the extent of reinstalling stock parts for the test and then putting the mods back on as soon as they get home.
Many vette owners on this forum are hot rodders and will be till the day they can no longer pick up a wrench or the government goes house to house confiscating illegal vehicles.
My advise is get used to it.
That means no discussion on this forum of changing cold air intakes, MAF's, intake manifolds, headers with or without cats, Z06 exhaust manifolds on LS2's, heads, cams, injectors, adding superchargers or turbos, etc and a Tune of any kind.
The forum would have to reject half or its sponsors and advertising.
It would become really boring around here. The more interesting threads would be "I'm picking my new vette up on Friday" or "I just put my second coat of Rejex on" or "My nav disc does not show my house"
Since the first car rolled off the assy line hot rodders have been modifying them. A rarely enforced/prosecuted law on private citizens will not stop it. Even in states with testing people cheat, some to the extent of reinstalling stock parts for the test and then putting the mods back on as soon as they get home.
Many vette owners on this forum are hot rodders and will be till the day they can no longer pick up a wrench or the government goes house to house confiscating illegal vehicles.
My advise is get used to it.
Well said!!
Pro
Joined: Mar 2006
Posts: 658
Likes: 0
From: Pa
I dont need to I got Bullets with AR headers so its pretty loud
Instructor
Joined: Apr 2005
Posts: 190
Likes: 0
i took mine out and i'm putting down 390
http://forums.corvetteforum.com/show....php?t=1798258
and i don't know what these other guys are talking about it smelling worse, it smells the same to me. they must be running really rich or something.
http://forums.corvetteforum.com/show....php?t=1798258
and i don't know what these other guys are talking about it smelling worse, it smells the same to me. they must be running really rich or something.
Last edited by yellowc6ohio; May 7, 2008 at 12:22 AM.
Le Mans Master
Joined: Jun 2007
Posts: 7,610
Likes: 12
In California, they set up these like smog check points on freeway on ramps ect with a camera and 5 gas. If you roll buy this thing with no cats they will bust you. I was told if a cop sees you have removed any smog devices removed they can actually impound your car.
