Okay, so I have a 2000 V6 with X-pipe exhaust. When I turn my car on, it sounds perfectly fine, but after I drive it around for a couple minutes it sounds like my exhaust is shaking uncontrollably. I've looked at the car while it's stopped and the pipes vibrating, but not more than it ever has. It only does this in drive, when it's parked it sounds normal. Anyone have any ideas??