I barely have 2000 miles on my s/c cobalt and like for the last week it has been making a really annoying rattle noise in the exhaust. I took it to the dealer and one of the guys trys to BS me and say its supposed to sound like that its part of the new "Stinger" package to make it racey. I laugh at him and say well it didnt sound like that when i bought it and im not stupid, so his boss i guess who was listening to the whole conversation turns around and say oh well yea that is a strange noise and we'll order the parts for you. So in the end it is getting fixed but they said they think the bezille or something broke loose inside so theyre replacing the whole thing i guess, and theyre fixing my sunroof switch thing. But those are my only problems so far, i was curious if anyone had the same problem. BUT OVERALL I LOVE THIS CAR

 

Mine has the same problem too, so i got my muffler replaced by the dealer.

 

you should just get a aftermarket exhaust like magnaflow.... it will sound a lot better then your stock exhaust


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i had the same problem before i got my new exhaust. It was annoying but i knew i was getting rid of it... i think it sounded like a heat sheild rattle

 

my cobalt ss backfires when decelerating. is that normal because i dont like it and i want my dealer to take care of it or change my plugs from titanium to copper. just lookin for some feedback.

 

from what i have heard its afterfire not backfiring, i think the stock sound of the exhaust sounds fine. No problems with myne so far

 

and with the afterfiring, i have been told it is normal with the way our stock exhaust is set up. kind of like how the srt-4's and wrx's sound when decelerating

 

if i change my plugs from titanium to copper do you think i would see any change or would htis not be beneficial for the afterfiring.

 

Mine is doing it too - but only sometimes.

Baffle inside it likely has come apart.

 

that popping your hearing is normal... its backpressure... and I don't know how you don't like it... I love it! I can't wait to get an exhaust to enhance those pops cause they sound great!

 

My cars exhaust is fixed now and compared to the rattle before i think it sounds pretty good. Im think it could be better but im gunna wait to see if borola comes out with anything i thought i heard somewhere that they were, and ive heard good things about borola so i think ill look into that!!!

 

My back fire sounds like a semi automatic being unloaded in Detroit. It's unbelieveably bad ass. Get the attention of that SRT-4 or hot chick driving by on road

 

i drove an srt-4 today and thats all you heard, sounds pretty good i think, i hear it sometimes in my car