I was thinking of removing my cat for the next four years (when you buy a new car in Az, you don't need it smog checked for five years), and was wondering if anyone on here's done it and what kind of results you got from it? A friend of mine is a good welder and said he'd do it for me for free if I wanted.

 

check engine light will follow

 

Agreed

 

What about a high flow cat?

 

You'll have a P0420 code every roughly 2 days because the PCM will think the cat isn't as efficient as it supposed the be. PLus the fact that it's reaaaaaaaaaaaaaaaaaaal loud. It surely gives you some HP if you have some supporting mods.

 

just get a dog

 

Anyone know how to bypass the CEL yet for it?

 

Hack the sensor with a resistor i guess, figure out what a Normal reading would be with a Multimeter, then unplug and buy the cooresponding resistor and put it in the sensor plug like those ghetto intake mods

 

i gutted my factory cat and yes its loud, but i likey

 

That wont work (not sure what resistance you mean) But an O2 simulator might. Many places sell them (google O2 simulator") and they plug right in and simulate correct O2 output from HO2S2
Wop

 

The stock converter is pretty high flow already, removing it may add small amounts of "peak" horsepower but isn't worth the noise levels.

 

Our Cat is already Highflow. I can't see how would would benefit out of it. I would try if it wasen't for the CEL.

 

they don't make one YET.. at least one that you can plug in. but on a 20,000 dollar car i am not cutting the sensor off, and splicing wires.

 

while we are talking about O2 Sensors. Anyone know where to get an extension cable? I can only find Ford ones online.

 

this is how we use to fix the cel on our evos should work for the cobalt as well it is a mechanical fix and you don't have to splice your wires http://forums.evolutionm.net/showthread.php?t=98573

 

tried it, it doesn't work. i have the drilled out antifoulers if anyone else wants to try it. lol

 

i tried to cut my cat...and i could not get the nuts off lol do you have to weld it off?? or am i just weak

 

SO basically, I'll get HP, but it's loud as ****, and I'll throw a CEL?

 

Yes you'll throw some CEL, even 3 times a day !

 

I was thinking of doing the same thing I don't car if it's loud or whatnot my car isn't even registered here in AZ

 

Let me know how it goes, then maybe I'll do it lol