Hi Dave,
I don't own a Thrux but I do love them and have always had a soft spot for cafe' racers in general.
Many years ago when I was in the habit of crashing rather more frequently than one aught to.
I had a four into two system for my cafe' racer Honda 500 four, mufflers filled and re-chromed, one side was badly grazed after a crash.
The job was done in Auckland New Zealand where I grew up and the job was brilliant, they were as good as or better than new and cheaper than buying the very expensive replacment aftermarket mufflers.
cheers,
DaveM