[Wayne 962]

It's nearly impossible to diagnose problems like these over the Internet, but if I were to take a wild guess, I would say that there's something loose in the exhaust that is causing the rattle. Probably pretty minor, but it is annoying though. I have an exhaust rattle in my Boxster right now - I think it's one of the heat shields. When the car is cold you might want to get under there and literally poke around with your hands to see if you can feel if any of the shields or pipes are loose.

- Wayne