Hey, I have been thinking about changing out my exhaust system, but at the same time I have also wondered if I just switch out the muffler for a magnaflow street or race series muffler. I am looking for a little performance gain, but overall a nice sound. Any suggestions?

 

I put a universal magnaflow on mine. Kept the stock piping. It sounded really good, then I put my intake on and it is pretty loud now. Still sounds good.

 

most people will say just put a new muffler on it...i say you are better off to buy the whole cat back because not only do you get a better sound you also get bigger piping encase you decide to go any form of FI...which is necessary...it just all depends on hopw much your willing to spend...CORSA makes a nice one for about 650 shipped from ttr

 

Is 2.25"-2.5" not good enough with F/I?

 

I myself think it would work but i have heard others say that we should condiering bigger piping for lots of FI...but then again look at the ss/sc...

 

I'd say replace the full Cat. back, there should be a big differance in gains.
as for size it really depends on how much air you'll think you'll be displacing.
for the LSJ crowed it's been pretty much decided that there isn't much to be gained from an exhaust as big as 3", unless you plan on making a lot of power.
so most people are sticking with the 2.5".
I'd imagine the same goes with the LE5

 

but which one sounds better and not as loud, a 2.5 or a 3.0?

 

but which one sounds better and not as loud, a 2.5 or a 3.0?

 

I have the gmmp performance catback and youll love it

 

The 2.4L Ecotec is the LE5. The LD9 was the old 2.4L Twin Cam

 

good catch I didn't even relize my brain fart .

a 3" will most likely be louder, as for which sounds better, it's a matter of taste, and the way it's made.
all the aftermarket exhaust sound different to eachother,

 

What about the O2 Sensor is it connected to the cat? I would want to leave that intact right? Also do you guys suggest doing the CAI or SRI before the exhaust.

 

Tomorrow I am getting my exhaust installed. It's the same Borla system that was installed on my buddy's Mercedes the other day. The exhaust is basically the same set up. I'm getting a new cat and removing the resinator. And then everything back will all new, except the tip. Cause I love the look of mine. His motor is a 2.3L, but his is also "kompressed." I should get similar results. I'll prolly get a sound clip on here for you guys sometime shortly after. Oh yeah...all of this installed+tax for $225, at a really acclaimed exhaust shop here in town!

 

hm i didnt even know an exhaust had an o2 sensor... i just figured they were on intakes only....the 3.0 will sound louder...i think it mostly depends on the type of muffler you get...and wether or not its touring or sport...

 

mike: *cough* narrowbands *cough*

24ss: the stock setup is mandible bent 2.5" up to the end of the res. really your not gaining anything from a catback except a big heavy stainless steel shiny pipe. cut the pipe where it funnels down to 2.25, replace the pipe and muffler and use the other 500 you saved for a CAI or something useful...

or on the other hand, maybe you live in a place that they salt the roads a shitload, and you need the $700 worth of stainless... in that case i would rent a uhaul and move somewhere that doesnt suck.

Good luck!

 

Exhaust is on. I can feel the difference, and it's louder than all hell! And it was actually an extra $11. But still, $236 aint bad!!! Good luck with yours everyone else!

 

If you are going turbo, bigger is going to be better. I would recommend just getting the muffler right now if thats all you really want to do because if you do go f/i you arent going to see great gains from just having wider piping from the last cat back, you are going to want 3" all the way thru, or close to it.

 

I'll tell you something that I'm sure most people wouldn't consider and I'm not going to get flamed over it. PM me if you think you are interested in hearing my opinion.

Scott

 

pour te donner une idée du son du Cobalt SS 2.4L avec l' Exhaust Cat-back de Gm va voir ce lien: http://videos.streetfire.net/video/b...2c00e3edd4.htm

 

not to be rude, but maybe you should think about what you say before you say it. the job of an O2 sensor is to detect the level of different gasses in the exhaust, thats why your A/F ratio can be changed by the O2's reading, hence, you would NEVER have an O2 sensor in your intake, intakes have AIT(air intake tempurature) sensors, MAP(manifold absolute pressure) sensors, MAF(mass air flow) sensors, etc.

Aaron