No Need For Cat Just Straight Pipe it!!!
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Joined: Nov 2004
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From: Hyde Park,NY
No Need For Cat Just Straight Pipe it!!!
I was thinking about geting a stright pipe to replace my catalytic converter. But i would install it so i could bolt it and unbolt it any time. Then when it comes time to get my car inspected i would just bolt my CAT back on
My Friend did this to his car and he had a magnaflow catback exhaust it made a EXTREMELY DEEP sound!!!
Has anybody done this with there TC?
My Friend did this to his car and he had a magnaflow catback exhaust it made a EXTREMELY DEEP sound!!!
Has anybody done this with there TC?
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Joined: Oct 2004
Posts: 95
From: Shreveport, LA
It depends on where you live first. In some states its a felony to remove the cat; California and Arizona I know this for sure. Now you may get it off cleanly, but that special exhaust tone will attract a lot of cops. Check your local laws on it first.
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From: Raleigh, NC
it will sound horrible. ive done it to my last car and it sounded like a lawnmower. your better off going custom with a muffler and leaving the cat. in any state if the cat is removed you are violating emission laws. plus youll throw a sheck engine light
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From: Austin, TX
Originally Posted by Yorker
Originally Posted by dante
do you even know where the cat is on the tC?? 
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Scion Evolution
Joined: Jan 2004
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From: In the Hot Tub
What's your license plate #? I need to call 1-800-exhaust!!!
Pollutants Produced by a Car Engine
In order to reduce emissions, modern car engines carefully control the amount of fuel they burn. They try to keep the air-to-fuel ratio very close to the stoichiometric point, which is the calculated ideal ratio of air to fuel. Theoretically, at this ratio, all of the fuel will be burned using all of the oxygen in the air. For gasoline, the stoichiometric ratio is about 14.7:1, meaning that for each pound of gasoline, 14.7 pounds of air will be burned. The fuel mixture actually varies from the ideal ratio quite a bit during driving. Sometimes the mixture can be lean (an air-to-fuel ratio higher than 14.7), and other times the mixture can be rich (an air-to-fuel ratio lower than 14.7).
The main emissions of a car engine are:
* Nitrogen gas (N2) - Air is 78-percent nitrogen gas, and most of this passes right through the car engine.
* Carbon dioxide (CO2) - This is one product of combustion. The carbon in the fuel bonds with the oxygen in the air.
* Water vapor (H2O) - This is another product of combustion. The hydrogen in the fuel bonds with the oxygen in the air.
These emissions are mostly benign (although carbon dioxide emissions are believed to contribute to global warming). But because the combustion process is never perfect, some smaller amounts of more harmful emissions are also produced in car engines:
* Carbon monoxide (CO) - a poisonous gas that is colorless and odorless
* Hydrocarbons or volatile organic compounds (VOCs) - produced mostly from unburned fuel that evaporates
Sunlight breaks these down to form oxidants, which react with oxides of nitrogen to cause ground level ozone (O3), a major component of smog.
* Nitrogen oxides (NO and NO2, together called NOx) - contributes to smog and acid rain, and also causes irritation to human mucus membranes
These are the three main regulated emissions, and also the ones that catalytic converters are designed to reduce.
In order to reduce emissions, modern car engines carefully control the amount of fuel they burn. They try to keep the air-to-fuel ratio very close to the stoichiometric point, which is the calculated ideal ratio of air to fuel. Theoretically, at this ratio, all of the fuel will be burned using all of the oxygen in the air. For gasoline, the stoichiometric ratio is about 14.7:1, meaning that for each pound of gasoline, 14.7 pounds of air will be burned. The fuel mixture actually varies from the ideal ratio quite a bit during driving. Sometimes the mixture can be lean (an air-to-fuel ratio higher than 14.7), and other times the mixture can be rich (an air-to-fuel ratio lower than 14.7).
The main emissions of a car engine are:
* Nitrogen gas (N2) - Air is 78-percent nitrogen gas, and most of this passes right through the car engine.
* Carbon dioxide (CO2) - This is one product of combustion. The carbon in the fuel bonds with the oxygen in the air.
* Water vapor (H2O) - This is another product of combustion. The hydrogen in the fuel bonds with the oxygen in the air.
These emissions are mostly benign (although carbon dioxide emissions are believed to contribute to global warming). But because the combustion process is never perfect, some smaller amounts of more harmful emissions are also produced in car engines:
* Carbon monoxide (CO) - a poisonous gas that is colorless and odorless
* Hydrocarbons or volatile organic compounds (VOCs) - produced mostly from unburned fuel that evaporates
Sunlight breaks these down to form oxidants, which react with oxides of nitrogen to cause ground level ozone (O3), a major component of smog.
* Nitrogen oxides (NO and NO2, together called NOx) - contributes to smog and acid rain, and also causes irritation to human mucus membranes
These are the three main regulated emissions, and also the ones that catalytic converters are designed to reduce.
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From: FUN4ADULTS
yorker, PLEASE for the life of your car, STOP listening to your idiot friends. Leave you airbox alone until you get an intake, leave your cat alone period, just by an exhaust if you want a deeper sound.
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From: Chicago, IL
i got the catback exhaust ... OH MY ... LAWSS ... someone cry me a river ... if i get locked up for having an exhaust it will be lame but still .. thats why i kept my stock ... so in 5 years i can just swap the biat&h out ..! you want a cat back system get it. You definatley feel performance. And it being a loud fart is not even close. The damn TRD dealer exhaust is louder then my magnaflow catback system!
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From: Germantown, MD
Removing the 2nd cat would make no difference to your computer so you'd get no CEL. There are no sensors on this 2nd cat. In Maryland. cars with OBDII are just hooked up to a computer, there are no tests on gases, so no CEL you pass. But your exhaust probably would sound like ____ without it anyway.
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From: Long Beach, CA
Re: No Need For Cat Just Straight Pipe it!!!
Originally Posted by Yorker
I was thinking about geting a stright pipe to replace my catalytic converter. But i would install it so i could bolt it and unbolt it any time. Then when it comes time to get my car inspected i would just bolt my CAT back on
My Friend did this to his car and he had a magnaflow catback exhaust it made a EXTREMELY DEEP sound!!!
Has anybody done this with there TC?
My Friend did this to his car and he had a magnaflow catback exhaust it made a EXTREMELY DEEP sound!!!
Has anybody done this with there TC?
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Joined: Jul 2004
Posts: 145
From: Orange County, CA
There are two different emission standards. The first was the standard set in California (California emissions). The second was the rest of the country (Federal Emissions).
Federal emission vehicles simply have a single catalytic converter underneath the car.
California has some of the strictest emissions regulations in the country. In order to meet these requirements, the Cali emission cars have, in addition to the cat found on fed spec cars, two precats. These precats are located inside the exhaust manifold. The precats heat up quickly due to close proximity to the engine, and are designed to reduce emissions of the vehicle until the main cat warms up. However, they can be extremely restrictive and cut peak horsepower by up to fifteen percent!!
My 99 Nissan Frontier developed a crack at the manifold and the stealer was asking $750.00 just for the manifold because it contained the restrictive precats. I simply bought the Federal version, which looks exactly the same but without the precats. Only cost me $150.00!!! It passed cali emissions with flying colors too!
If Toyota is using California emissions for all 50 states, and you don't live in Cali, you should be able to replace the restrictive precats with some performance headers w/O2 sensors so that your check light won't come on.
Also, it's actually a Federal crime to remove the cat in all fifty states. And if you gut it, your check light WILL come on.
Federal emission vehicles simply have a single catalytic converter underneath the car.
California has some of the strictest emissions regulations in the country. In order to meet these requirements, the Cali emission cars have, in addition to the cat found on fed spec cars, two precats. These precats are located inside the exhaust manifold. The precats heat up quickly due to close proximity to the engine, and are designed to reduce emissions of the vehicle until the main cat warms up. However, they can be extremely restrictive and cut peak horsepower by up to fifteen percent!!
My 99 Nissan Frontier developed a crack at the manifold and the stealer was asking $750.00 just for the manifold because it contained the restrictive precats. I simply bought the Federal version, which looks exactly the same but without the precats. Only cost me $150.00!!! It passed cali emissions with flying colors too!
If Toyota is using California emissions for all 50 states, and you don't live in Cali, you should be able to replace the restrictive precats with some performance headers w/O2 sensors so that your check light won't come on.
Also, it's actually a Federal crime to remove the cat in all fifty states. And if you gut it, your check light WILL come on.
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That thing in the middle of your car is the resonator, if you want a deep sound, cut it out and magnaflow makes a glasspack that follows the same dimensions as the resonator, after that, put on another magnaflow for your muffler. This will give you a nice low tone, the shorter you go on the resonator muffler the louder the car will be. The glass pack absorbs most of the higher pitched sounds, so the more you have the lower the tone, but too much and you will hear almost nothing. my buddy has a cadillac CTS-V that he did this too, im not saying the Tc and CTS-V are comparable on any possible level aside from having wheels and a steering wheel... if even that, he put in the magnaflow for the resonator and had dual magnaflows for the mufflers and this thing sounds magical, it sounds better than his Corvette.
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Originally Posted by DGTLLVR
Originally Posted by Yorker
Originally Posted by dante
do you even know where the cat is on the tC??
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Joined: Apr 2005
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From: Baton Rouge, LA
Originally Posted by ack154
Straight-pipes sounds a little bit redneck-dodge-ram-ish. This probably goes on my list of "___ tC mods people do" (or would like to do).