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Old 02-06-2007, 10:05 AM   #1
idoyako
Go-Kart Driver
 
Join Date: Sep 2006
Location: Philippines
Posts: 73
Default Question about the Catalytic Converter

Im a noob. Ok I dont know if im in the right place but I will give it a shot.
Me and my friend both have A/T 1.6 mazda 3's he bought his in 2005
and i bought mine last year in may. We both have what nearly
everybody has done here when they get there mufflers done, where
they take out the silencer (water bottle looking thingy) and replace
that with a straight pipe that goes to the end and install the universal
muffler at the end (well thats what I think they do) so literally this
does nothing to the performance and the main point is to make a loud
sound. going back to both cars, I have noticed his is far more louder
than mine, so i went up and asked him why is it so loud, he told me when
he got it done they took out the catalytic converter, I have heard this
makes the sound increase. So the other day I went to the local muffler
shop and they took a look at the bottom of the car and they said the
catalytic converter was attached to the manifold and they have not
encountered that type of thing yet and will not be able to be taken out.
So I ask them what did they do to my friends car because it was the catalytic converter taken out.

My question is 1.) can you guys broaden my mind with what is a catalytic converter and what does it do 2.) Is it bad to take it out (I heard from some dude that when its taken out it makes the car faster) (And some other person told me that it is bad to get taken out) 3.) can anyone explain to me why they said that the catalytic coverter is connected to the manifold. 4.) Is my friends under body different from mine? Philippines does not exactly change the whole chassis and underbody of the 3 every year like in the states. So whats going on?,,

Sorry for such a long post guys, hope I can get some help here. Thanks.
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Old 02-06-2007, 12:23 PM   #2
HouRman
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Location: Laguna Hills, Southern California
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Default Re: Question about the Catalytic Converter

There's two catalictic converters in our cars. They clean the air to save our environment.

To get rid of the first cat, you'll have to get an aftermarket header since it's built into the exhaust manifold.

The 2nd cat is a canister type before the muffler. People get rid of this by getting either a straight through pipe/race pipe. Or they replace it with a high flow cat.

Maybe your friend replaced his muffler and 2nd cat, while you replaced just your muffler... i dunno.
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Old 02-06-2007, 03:16 PM   #3
azazel1024
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Location: Ellicott City, MD
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Default Re: Question about the Catalytic Converter

It isn't a silencer, it is a resonator. It will generally increase the sound slightly by removing it, but its main purpose is to tune the exhaust note to a certain tone. As you mentioned it has very little effect on performance. Installing larger/less restrictive exhaust piping and a higher flow muffler will increase performance some, but it does a lot more to increase sound then performance.

A catalytic converter is either a bunch of pellets housed in the exhaust or a honeycomb setup in the exhaust coated with 3 different metals (all extremely expensive) that cause the exhaust gases to recombine or split in to more desirable compounds. So Carbon Monoxide (CO) combines in to Carbon Dioxide (CO2). Oxides of Nitrogen (NOx) split into Nitrogen (N) and free oxygen (O) and unburnt volitial organic compounds (unburned gas/VOCs) split/combine into carbon dioxide and water (H2O).

So removing it is extremely bad for the environment. It will increase the exhaust volume a resonable amount it can also free up some performance. That being said getting a cheap high flow catalytic converter doesn't cost much, cleans fairly close to as well as the stock converter on there, and adds close to the same volume and performance gains that removing the stock converter and having none on there at all does.
-Matt
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Old 02-07-2007, 09:00 AM   #4
idoyako
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Join Date: Sep 2006
Location: Philippines
Posts: 73
Default Re: Question about the Catalytic Converter

HouRman thanks on that its starting to
make a bit more sence, I'll dig into it
when I take my car to the local muffler
place some time soon

oh yeah and Matt thanks for telling me
what it really is, I acctually printed that
out as a reminder

thanks again guys
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Old 02-07-2007, 07:41 PM   #5
florida3
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Default Re: Question about the Catalytic Converter

dude, i love that drifting catapillar, thats the best vid on here
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