It just started about couple weeks ago. I have a different sound coming from the exhaust then I have ever herd from it. Cant explain the noise but its higher pitched than before. I have a Magnaflow cat-back. At Idle its fine and the sound is most prevelant when I first startup and take off. After the car has been running for a while it only sound that way when I am farely heavy on the gas. I looked inside the muffler and cant see anything unusual. Could it be a bad Cat converter or resonator issue?

Anyone else have any Ideas??

 

So when it is cold it makes a higher pitched exhaust note? Then when it warms up it turns into a deeper with no rasp tone? Mine does the exact same thing. Post a video. Shouldn't be gunning the car when it is cold anyway. :P Haha

 

When I start the car you wont hear it. Just when I take off and It doesnt have to be a fast take off nothing over 2000-3000 rpm. When the car is warm it comes at a higher rpm. The exact noise is hard to explain its sort of a raspy sound like something is loose but as the car gets hotter the it seem to go away until much higher rpms (say 4-5000)

 

I have the exact same problem. Took it in to the dealer and they told me it was the converter plugging up, which they wouldn't fix because of the cold air intake. I switched the airbox back to stock and took it back in and they couldn't find anything wrong with it. Still making the same noise.

 

hmmmm.....a clogged cat will reduce ur exhaust noise it wont be deep at all it'll sound like stock and ur psi's will rise dramatically..

 

humm....
I want to say i have the same issue....
I have a Magnaflow 2.5 cat back and it sounded good till about 3 months ago now on WOT at about 4000+ rpm it get vary raspy...

 

Have the same exhaust and have noticed a similiar problem...

 

same problem but im catless

 

Ok do you have the magnaflow muffler as well, if so they pack them with something and after so long it fails, i dont know more than that about them, just that a friend said not to get one for that reason

Do you all have magnaflow tip?

 

naw i have the megan catback

 

Oh well nvm, how does that sound btw, price seems good if the pipe is good?

 

they are to loud im trading it for a stocker. http://www.youtube.com/watch?v=qTZpKcinetw

 

So your going back to stock? Ya thats loud but you did say you were catless

 

just the catback will be stock

 

Ya I have a 2.5 magnaflow cat-back but I left the stock cat on because I was coming to Ontario and they have strick emision laws so maybe it is the cat.....

 

Gotcha, dnt you have some headers too?

 

yeah i have cti headers, xtc dp and megan catback and i just sold my racing solutions header and dp to my brother

 

could be, rip it off and find out

how are the cti?

 

**** i dunno they were on it when i got the car so i dont really know the differnce

 

OH gotcha

 

Its the magnaflow cat back with a summit racing 4" tip on mine. But like I said its fine when the exhaust is hot just when its cold it sounds funny about 2500rpms

 

thats just the ecotec kickn in