i have a crackling sound under my car when i drive it for a while and its like a crackiling sound but dont know what it is. When i drive it aggressively it gets even louder. Took it to the dealer but they dont know what it is.

I thought it was the cats at first but had them checked and they were ok

anyone know please help!!

 

sounds like some bolts got loosen.

 

only has 70k on it, is that possible ? and when you say bolts what do you mean?

 

i can only hear the sound when i stop

 

I mean the bolts which connet your exaust and y pipe and so on, the best way to solve it is to get it inspected.

 

Its just the heatshields....excuse to get new exhaust.

 

What he said... It is the heatshields on the y pipe... As soon as I replaced my exhaust system noise went away and never came back

 

is your cat missing??

 

If by "stop", you mean when the engine is not running, & the sound you hear is a tick, tick tick, it's normal. It's just normal sounds the exhaust makes when it's cooling down.
Sometimes we see these type of posts from someone who just made room in their crowded garage (prior storage area) for their cherished ride and they are not used to hearing the sounds a car makes when cooling off in a quiet environment.

 

by stop i mean when its running but parked, and the cats arent missing.

 

Check out my thread on popping noise front end they solved it

 

Heat shields?

 

I'm having the same problem. Did the dealership replace the exhaust under warranty?