Thanks to everyone for the great thread. I have been thinking about a muffler for my 3.7 and I have loved and used Flowmasters for years. I really dig the sound of that 50 and think that's the way im gonna go.
I found one on Amazon for $120, Ill see if I can find it for less, but that is not too bad a price. I can bring it to work and have one of the welders in the metal shop weld it up for me so Ill save alot that way.
Anyway, thanks again for the killer info, I found out much.