So, I started noticing that exhaust has a rattle when I push the car hard. It comes around 3K and goes away around 3.5K RPM. Very annoying. It also makes quite a racket at cold start but after few mins of warm up the rattle goes away. Had the dealer take a look at it. He took a rubber mallet and tapped the entire exhaust and fund slight rattle in the rear section (after catalectic converter). He put in a part request. First I was under the impression that they will replace the exhaust but later I found that they ordered heatshield and bracket parts that holds the exhaust. I have taken an appointment for Friday to get the parts replaced. Will keep you guys updated. The sound does feel like a loose heat shield. But when the car was up on the jack I could not see any heatshield. Not sure. Any pointers?