Had my exhaust installed. The 50 series sounds pretty good actually. Not as loud as the 40, but sounds pretty deep. A little rumble at idle and quiet on the highway. It took longer to get the stock exhaust off than to install the Flowmaster setup. It took 20 minutes tops, including getting the pieces aligned. The technician said this was the best fitting, easiest install he has done. Everything fit together perfectly. All the guys there loved the sound.