Flowmaster vs DynoMax super turbo- 1970 Dodge Dart 360 with comp cam muther thumper. Car was very loud with the flowmasters so my plan was to quiet it down some by adding in a X-pipe and a different muffler. My muffler guy suggested I go with super turbos because it was the quietest performance muffler he has. I'm happy with the out come still has a nice tone and when in driving it at about 50mph it holds a nice quiet tone inside the car