Does anyone think there will be any gains for doing this. I am going to wait for borla, but in the mean time I was thinking of puting in a straight pipe? What about throwing engine codes? Thanks for the input in advance.

 

I know on my LS1 Trans Am I gained quite a bit of power from removing the cats (about 10 rwhp) and replacing with an offroad pipe. All you need to keep the car from throwing a CEL would be to replace the rear O2 sensor with an O2 simulator. I dont however know how much power this will give the 2.0 SC motor but if you have the resources to try it then what could it hurt.

 

Yeah, i did it on my LS1 Camaro, It gave me a lil bit of power, along with making it sound bad ass. Just dont get caught by any emmisions checks...

 

I made an offroad down pipe for my car and it seemed to help a bit. It needs a o2 sim otherwise it will throw a code.

 

whats an o2 simulator, and where can I get one. Has anyone done this to there 2.0 cobalt?

 

Err 4 cylinders without cats produce a ton of smoke, sound bad, plus its illegal.

 

yea dont do it man my freind got slapped with a pretty fine forse it

 

mines not smoking.....dosn't sound the best though.

 

http://www.o2sim.com/

 

Since the one on the SS is high flow you might gain 1-2 Max HP by removing it.

You can't really compare a 4cyl with a 2.5 inch exhaust to a V8 using a Y-Pipe with 2.25. The HP you gain in a F-Body is due to a better pipe (maybe even bigger) and a better collector where it goes to the intermidiate.

 

Can anyone else giv eme any input. I am tired of waiting for borla but I know it will be worth the wait. As long as it isn't a fart can.

 

you wouldn't have any videos or a sound clip would you?

 

i know in kentucky it's a $10,000 fine for messing with the emission systems on cars post 1995 or something like that... maybe it's 1985

 

If you get caught, lol.

 

in lancaster my car doesn't need to pass emissions

 

The only way you would gain any hp is if the cat is restrictive. On older vehicles you notice big gains because the cat that was removed was clogged up and now the exhaust is flowing like it should. I havn't looked at our cats but if they are a bigger and high flowing like I have heard, you wont notice anything but more noise.

 

go 3" with the o2 sim no cat suppossed to be good gains from that on these cars .

 

I wouldn't bother just gutting the cat, I have a whole new 3" mandrel bent pipe on mine now. There are some fairly restrictive parts on the stock downpipe.

 

nope sorry, its loud though.

 

you gotta get some, Is it obnoxious, if so I guess I'l just wait for the 3 inch borla.

 

It's going to be a fart can, No matter what if you make it straight, and take the Cats off. Plus any good engine needs Some back pressure, to scavenge all the unburnt gasses. Straight pipes, dont allow for that. Best bet is to wait for Borla a 'lil longer.

 

OBNOXIOUS

 

I was talking about borla when I said as long as it isn't a fart can. I just hope it isn't. hopefully no bigger then a 3 inch outlet

 

Oh, Ok! I see what you're on about.

 

does that mean yes