I own a 2005 M3 ZCP and finally bit the bullet and replaced that OEM Ship anchor of a muffler with a Supersprint Race one. I had read all the stories about Drone and Rasp and had some reservations that the Drone was going to be very annoying. To my surprise, it's absolutely fantastic and what some people call Drone, I think a better description would be volume increase. For anyone not familiar with it as I was, it sounds like the volume of the exhaust has been increased at around the 2700 to 3000 rpm and reduces after that. I REALLY Like it and for anyone unsure whether or not they want to pull the Trigger, don't be scared, this muffler is the one that BMW should have equipped this car with in the first place.