Slitted it, welded on two nuts, drilled out the upper one, and clamped it onto my cat.
It didn't come loose so far.
Vibrations might be a little more compared to the standard muffler, but during a 450 kilometer high speed trip (in Germany; almost no speed limits there, so most of the time full throttle
I'm thinking of welding on an extra bracket to the tip to create an additional support point for the cat.