Removed cats?
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 898
Likes: 0
From: Oklahoma
Removed cats?
Hello,
Has anyone with a C6 removed the cats? I am planning on doing this perhaps sometime this week. I just had to see if anyone else has done it and how the car sounds or if it smells at all? Would it pass emissions? I don't want to see a post showing the penalties for doing this. I just want to hear from the people who have done it or know someone with a C6 that has done it. I have a magnaflow exhaust BTW.
Has anyone with a C6 removed the cats? I am planning on doing this perhaps sometime this week. I just had to see if anyone else has done it and how the car sounds or if it smells at all? Would it pass emissions? I don't want to see a post showing the penalties for doing this. I just want to hear from the people who have done it or know someone with a C6 that has done it. I have a magnaflow exhaust BTW.
Drifting
Joined: Oct 2006
Posts: 1,732
Likes: 2
From: Naples FL
I will be running no cats in the future on LT headers but right now its just stock. Will it smell...yes. Also I'd say prob. only a few decibels louder nothing extreme If you plan on taking them off your stock exhaust headers/downpipe or whatever. Don't its a waste of time. Just leave them on till you get some LT headers.
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
Hello,
Has anyone with a C6 removed the cats? I am planning on doing this perhaps sometime this week. I just had to see if anyone else has done it and how the car sounds or if it smells at all? Would it pass emissions? I don't want to see a post showing the penalties for doing this. I just want to hear from the people who have done it or know someone with a C6 that has done it. I have a magnaflow exhaust BTW.
Has anyone with a C6 removed the cats? I am planning on doing this perhaps sometime this week. I just had to see if anyone else has done it and how the car sounds or if it smells at all? Would it pass emissions? I don't want to see a post showing the penalties for doing this. I just want to hear from the people who have done it or know someone with a C6 that has done it. I have a magnaflow exhaust BTW.
I did remove it from my Porsche Turbo and had no smell. It really sounded great with a lot of off throttle burble.
But it was a very rare car which was exempt from the smog police.
Last edited by siffert; Jan 29, 2008 at 12:08 AM.
Racer
Joined: Jan 2008
Posts: 285
Likes: 0
From: Boca raton Florida
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.
Burning Brakes
Joined: Jun 2007
Posts: 878
Likes: 144
From: Little Egypt, USA
Cars didn't have cats until 1975, if the smell didn't bother you then it won't bother you now if the car is properly tuned. If your state requires an emission test leave them on, if not remove them and enjoy better sound, flow and power.
Last edited by wbear; Jan 29, 2008 at 08:53 PM.
Race Director
Joined: Jan 2004
Posts: 18,726
Likes: 710
From: Bergen County, NJ
Burning Brakes
Joined: Jun 2007
Posts: 878
Likes: 144
From: Little Egypt, USA
I would assume that a cat less vette, running in closed loop (idle or off idle) with properly functioning O2 sensors would not smell any worse than a 60's muscle car. It should smell less since it has a modern accurate fuel metering system opposed to a gas dripping mechanicaly controlled carb.
I'll have a personal comparison soon as I am installing headers with no cats as soon as the weather warms up.
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Racer
Joined: Jan 2008
Posts: 285
Likes: 0
From: Boca raton Florida
I think there might have been a smell but all the cars smelled that way and everyone was used to it. You could tell the engine was burning gasoline but people didn't have to change their clothes after standing behind a car as one person stated on the forum. Younger people are so used to the almost zero smell of a modern catted car that when they are around an un catted one they complain.
I would assume that a cat less vette, running in closed loop (idle or off idle) with properly functioning O2 sensors would not smell any worse than a 60's muscle car. It should smell less since it has a modern accurate fuel metering system opposed to a gas dripping mechanicaly controlled carb.
I'll have a personal comparison soon as I am installing headers with no cats as soon as the weather warms up.
I would assume that a cat less vette, running in closed loop (idle or off idle) with properly functioning O2 sensors would not smell any worse than a 60's muscle car. It should smell less since it has a modern accurate fuel metering system opposed to a gas dripping mechanicaly controlled carb.
I'll have a personal comparison soon as I am installing headers with no cats as soon as the weather warms up.
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 898
Likes: 0
From: Oklahoma
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.
Racer
Joined: Jan 2008
Posts: 285
Likes: 0
From: Boca raton Florida
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.
Sorry bout the long post good luck.
Burning Brakes
Joined: Jun 2007
Posts: 878
Likes: 144
From: Little Egypt, USA
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.
If you are not going to put headers on just taking off the cats is a waste of time. Save up your $ and get headers.
Pro
Joined: Oct 2007
Posts: 538
Likes: 1
From: Niles Michigan
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.
Racer
Joined: Jan 2008
Posts: 285
Likes: 0
From: Boca raton Florida
I can't see how an exhaust shop can say it takes away performance. Maybe they should go for a ride in my car, I think I can prove that theory wrong. I also thought it was illegal for an exhaust shop to remove the cats. I don't think I would just remove my cats without installing headers and an off road x-pipe. As far as the car sounding like crap, man he has no idea how wrong he is!!!!
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 898
Likes: 0
From: Oklahoma
I'm young too and think a louder car sounds awesome. Me being the impulsive person I am, I'll probably drop by one day and get them removed because i'm bored. If that does happen I'll post up what I think about it. Again, I really appreciate the info from you all.
Racer
Joined: Jan 2008
Posts: 285
Likes: 0
From: Boca raton Florida
Thanks for the input everyone. I'll probably just wait until I put headers on then take the cats out or put high flow cats on. I just wanted to get a bang for the buck upgrade that improves sound. But I really don't want to make people's eye's behind me water up. What if it's a 9 year old? or better yet what if it's a chick that i'm hanging out with that follows me on the highway or something?
I'm young too and think a louder car sounds awesome. Me being the impulsive person I am, I'll probably drop by one day and get them removed because i'm bored. If that does happen I'll post up what I think about it. Again, I really appreciate the info from you all.
I'm young too and think a louder car sounds awesome. Me being the impulsive person I am, I'll probably drop by one day and get them removed because i'm bored. If that does happen I'll post up what I think about it. Again, I really appreciate the info from you all.
Pro
Joined: Oct 2007
Posts: 538
Likes: 1
From: Niles Michigan
Thanks for the input everyone. I'll probably just wait until I put headers on then take the cats out or put high flow cats on. I just wanted to get a bang for the buck upgrade that improves sound. But I really don't want to make people's eye's behind me water up. What if it's a 9 year old? or better yet what if it's a chick that i'm hanging out with that follows me on the highway or something?
I'm young too and think a louder car sounds awesome. Me being the impulsive person I am, I'll probably drop by one day and get them removed because i'm bored. If that does happen I'll post up what I think about it. Again, I really appreciate the info from you all.
I'm young too and think a louder car sounds awesome. Me being the impulsive person I am, I'll probably drop by one day and get them removed because i'm bored. If that does happen I'll post up what I think about it. Again, I really appreciate the info from you all.
Get yourself a set of Kooks headers, Kooks off road x-pipe and Borla Stingers. You will have to tune your car when you get the headers, but it would be worth every penny!!!
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 898
Likes: 0
From: Oklahoma
Well I got bored of the magnaflows and removed. I didn't remove my cats... When they started it up after finishing it sounded too good to be true. I should have done this mod a long time ago. I was thinking about running straight pipe temporarily until I could get B@Bs but I may just leave it the way it is now. The only thing I was worrying about was drone, but it's not as bad at all. It feels good driving it now. 
Race Director
Joined: Oct 2005
Posts: 14,555
Likes: 1,255
From: Saint Albans, WV
With my setup, Corsa Sports, KOOKS w/offroad x-pipe (no cats) I do have drone at 1700rpm. The sound is simply ferocious, but if I had to do it over I would install high flow cats due to the odor that penetrates clothing and skin.