Alright guys, I started the car up the other morning and then walked back inside to grab a few things before leaving for work. When i came back out my car had a really weird exhaust tone to it. I really dont know how to explain it. It kinda sounds like something isnt allowing alot of exhaust out or something like that. I did throw the P0300 and P0420 code when it was sitting there at idle. It drives fine and everything but as soon as it idles it has a very different exhaust tone.

Any help would be much appreciated

 

cat probs

 

thats what i figured....

 

definitely the cat