2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque

No catalytic converter on the 2.4L?!

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Old 03-08-2008 | 06:00 PM
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TheDriver!'s Avatar
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Question No catalytic converter on the 2.4L?!

Just before I go to my part time job I was very curious in asking.. Can you remove the catalytic converter and just throw a peice of pipe on there? Here in Alberta it is not illegal to run without but funny thing its illegal to run no muffler but ya can it be done with little issue? And if not and you need to have the sensor wired in can any high flow cat work on our cars?

thanks for any info you can give..
Old 03-08-2008 | 06:02 PM
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Put a high flow cat on there. Without the cat the exhaust note will sound really raspy. There is a minimal gain in going without a cat as opposed to getting a high flowing one.
Old 03-08-2008 | 06:02 PM
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well, you CAN, but it will throw a CEL.

now, they do also make a kit to eliminate the CELs as well...

but, it would all be worthless without a high flow manifold and downpipe, just the cat itself isn't an issue.
Old 03-08-2008 | 06:13 PM
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so you're saying with a high flow cat it will throw CEL as well right?
Old 03-08-2008 | 06:18 PM
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Originally Posted by PenguinPIE
so you're saying with a high flow cat it will throw CEL as well right?
uhhh, it could. i've heard both.
Old 03-08-2008 | 06:22 PM
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Originally Posted by PenguinPIE
so you're saying with a high flow cat it will throw CEL as well right?
mine did on my 2.0, but use two spark plug anti-foulers and no more code.
Old 03-08-2008 | 06:34 PM
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Originally Posted by Hockeyman
mine did on my 2.0, but use two spark plug anti-foulers and no more code.
whats that?....im really noob at this :P
Old 03-08-2008 | 06:52 PM
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No cat sounds awful... a member on here did that to his 2.2 and I wasn't a fan at all, sounds ricey.
Old 03-09-2008 | 01:04 AM
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not cat=loud cobalt....i wud go h/f cat..u really wont through a code with the cat..possible from a messed o2 sensor..but if u go catless hptuners can do the famouse cat delete..meow? goes bye bye
Old 03-09-2008 | 11:39 AM
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<----has no cat
<----has a CEL
<----has a raspy exhaust note
<----loves it
Old 03-09-2008 | 11:41 AM
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haha nice one man...lol
Old 03-09-2008 | 11:42 AM
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Cars with no cats only sound good if they're V8's. Otherwise, high-flow that bitch. I may do the same if I mod my exhaust..
Old 03-09-2008 | 11:49 AM
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If you want rid of it just bring your car down here and park it, shouldn't take long for someone to steal it off your car and take it to be recycled for the money.
Old 03-09-2008 | 11:49 AM
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Ok but one of my questions is still un answered....

can you put any high flow cat on there? I mean I know the pipe diameter has to be right and you need the sensor port but ya someone please point me in the right direction or understanding..

thankyou
Old 03-09-2008 | 11:56 AM
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Good question. I've never seen it before, so I just imagined it was a standard kind? lol. But I'm sure if the pipe diameter is the same that it'll be ok.. But hopefully someone else will know..

Anything else you need to replace under there? Any 02 sensors or anything? I know sometimes there's weird things.. Like on my dads '04 Monte SS there's something called a U-bend. something with a sensor. People always straight pipe that.
Old 03-09-2008 | 12:02 PM
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Originally Posted by iLLmaTic3s
haha nice one man...lol
Why thank you, lol.

I like loud. (And lamp)
Old 03-09-2008 | 04:43 PM
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how loud is high flow cat anyway? i heard a lot of youtube vids and they all sound kinda raspy (not sure if its exhaust of the cat)
Old 03-09-2008 | 05:28 PM
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NamedGoBalt just put a full 3" Vibrant setup (header, dp and cat-back), and it features a high flow cat, and its still hellaciously loud. I can't tell whose car is louder....mine or his.....they're different types of loud you could say.
Old 03-27-2008 | 02:34 PM
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if you guys want loun get that shitty ass slp system...loud as **** and sounds like a pos...on second thought dont even think of getting that annoying ass pepboys sounding exhaust...
Old 03-27-2008 | 03:17 PM
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Originally Posted by cobeeezy
if you guys want loun get that shitty ass slp system...loud as **** and sounds like a pos...on second thought dont even think of getting that annoying ass pepboys sounding exhaust...
Haha, oh you'll love my exhaust note then

Its w/o a doubt the loudest 2.4 you've ever heard.
Old 03-27-2008 | 04:31 PM
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what do you have?
Old 03-27-2008 | 05:11 PM
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Originally Posted by cobeeezy
what do you have?
CA header + XTC 2.5" de-cat downpipe + ARK N2 cat-back.
Old 03-27-2008 | 05:23 PM
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damn you i want that n2
Old 03-27-2008 | 05:37 PM
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Originally Posted by cobeeezy
damn you i want that n2
Haha yeah its been on my car since November '06. I had it pre-ordered directly through ARK 3 months before it even came out. Asides from the tester car, I was the first Cobalt in the general public to have it. And I was the first 2.4SS period to have it on. Pioneering Cobalt **** FTW son! Haha
Old 03-27-2008 | 05:41 PM
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No... your car will implode. It has a Self Destruct system that detects when you have removed the Cat.


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