i got my car back.....finally they had the damn thing for three weeks.

i noticed a rattly noise seemingly coming from underneath especially when i'm slowing to a stop.

anyone have any ideas what i should look at first(after the exhaust) when i get under there.

 

The cats might be lose that is what happened to mine.

 

You think you are hearing a rattle from behind the mufflers?

The whole after the exhaust comment is throwing me off.

What do you have for a catback? My GT's Magnaflow setup, the set screws would back off on the exhaust tips and let them rattle...