Just two days ago I received two Thrush glass pack mufflers ordered from Summit.
These will be installed on the ‘56 Stude Golden Hawk I’m restoring.
I run these same mufflers on my ‘55 Speedster, my ‘63 Avanti, and my ‘83 everyday driver Avanti.
I think they produce a nice mellow sound.. and other folks have also given the exhaust tone a ‘thumbs up’ !
Their casing seems to hold up a long time, they are relatively inexpensive ($26), and stand up well with a stainless exhaust system.