my muffler
 

my muffler rattles from the inside when rev it up and at idal do you know what it is?

RE: my muffler
 

Maybe the baffles inside your muffler are falling apart or have come loose. How old is the vehicle and is it factory exhaust?

RE: my muffler
 

what kind of muffler is it? stock? because I have a dynomax turboflow and i think shes broken loose because at about 3200 its starts getting real tinny---just started doing that last week[:@]

RE: my muffler
 

Yopur sure its the muffler and not the cat?

Either way, it needs to be replaced.

RE: my muffler
 

I had a problem like that with my stock muffler. Just replaced it with an after-market catback exhaust system and the noise didn't happen anymore.

RE: my muffler
 

This happened to a truck that someone brought into the shop at my school. ended up just being a rock stuck in the heat shield. He had taken it to a muffler shop beforehand and they ha told him hed have to replace everything

RE: my muffler
 

yaa, very likely muffler or cat, my exhaust does the same thing [>:]
I need to replace my cat.....