I have one flowmaster 40 just replacing the factory muffler and love the sound of it. I've had many other people with rams ask me what the exhaust setup is because they want to do the same. It stays very deep and isn't raspy. On the highway it's not overbearing and sounds classy.
2010 Dodge Ram Sport Crew Cab-Optioned out and slightly modded: Flowmaster 40 & Vararam Air Grabber