yeah, i did this on my other car, I have 3 straight through resonators and it muffled the car to an extent, but still has some good flow. I was forced to remove the cat on that car because it was old and rusting through.

If you live in a place that checks your emissions, then it would be best to just get a high flow cat. New highflow cats can flow more than 450 cfm.

 

I'm not running a cat because i don't have to pass emissions till june of 08. I will be putting one on next year tho.

 

Diasble the following ODB-II codes if your running no CAT & removing the second o2 sensor:

P0036
P0056
P0136
P0137
P0138
P0141
P0430

It will be noticeably louder and buzzier. Install a second resonator and get a chambered muffler installed to reduce sound. If you have stock muffler, enjoy! It sounds pretty good IMO.

 

I have been running catless since saturday and have not seen any CEL. ???

 

Me too! and its not raspy either,is yours?

 

mine has been removed for 1 month now because even in stock form (the car) it was plugging and the dealership won't fix it anymore. I went thru 6 cats in 2 years until I said I had enough. I did everything they told me.

 

you probably will soon. but if not, more power to you. thats a good thing, dont jinx yourself.

 

Thats real shitty,no more cats for you.

 

dude, rich ass tunes clog cats, thats just the way it is. your stock tune was probably super rich. you gotta remember, gm has to take into consideration winter in canada and alaska.. as well as summer in arizona/utah/texas.. a good hptune would've fixed the issue, but now with the 60's you need a rich tune, so catless is the only way to go.

 

When I had HP Tuners on stock format and had the tune setup to be really leaned out it still clogged. It's called poor design. You will find the same converter on the base model 2.2's and 2.4's. Supposedly it's "high flow" but based on flow charts the converter flows the same for all models so you tell me.

My 2.2 Cobalt Sedan suffers from this as well and it's stock (replaced twice now) too so you tell me how a car running 87 octane runs rich...... I got sand in the desert to sell you.

 

Actually the SS model cat is much larger.

The cat on my SS downpipe DWARFS the one my 2.2 DP

 

funny, they look exactly the same size to me.

In any event you cannot blame the stock tune for it clogging. The car runs super lean from the factory. To such a point that most SS/SC's are poppin 90%-120% injector rate from the factory and the AFR's i've seen run almost mid 12's @6300RPM (not even finished in 2nd or 3rd.) It climbs in third by .2 more afr on average i've seen.

If your talking about the GM stage tunes then yes I believe you when I say they are running super uber rich. When your only tapping 50-60% IDC with an AFR at like 10.5 -11 then obviously there is some room to play with.

 

any recomandation on high flow cat for sale??

 

Don't go Magnaflow. Try a Walker high flow Converter.

http://www.walkerexhaust.com/products/converters.asp

 

WHAT THE PRICE OF THOSE RUN?

 

maybe this will help some of you who get cel from catless or gutted http://www.******************/forums...fast-easy.html

sorry guys it wont let me link to the redline forums,but it is a 5 dollar part that screws into your dp then you screw the o2 sensor on it and it takes away the CELs

 

Aah Any Other Online Store You Can Link To?

 

basically it is sparkplug non foulers they are 18mm

 

No cat ftw!

 

some +rep would be accepted for my researching effort. LOL!!!

 

I tried not one.....but TWO of those type things. They are often called CEL eliminators or O2 foulers. My de-cat downpipe caused a CEL, so I tried both the Weapon-R and Voodoo Boost CEL eliminators. They are basically spacers the position the O2 sensor away from the downpipe so the ECU won't get such an extreme reading. The Weapon-R one barely fit, but it was too long and ended up getting ripped out while I was driving. The Voodoo Boost one just plain didn't fit underneath the car. The heatshield tends to get in the way when you try to make these work. I just roll around with a CEL until I get it tuned with HP Tuners.

 

WHAT FTW STAND FOR?

 

FTW= For The Win