Hall Big-Bore exhausts were popular with hard-of-hearing owners back in the day. I liked their looks so bought a set (used) and did a 50 mile tour in the mountains with them. Took them off as soon as I got back home & they cooled down. Turned out I was the 3rd or 4th owner that did the same thing. Aluminized and well made with one little problem: they used thick, crushable circular 'doughnut' gasket-rings between my Hooker headers and the Hall exhausts, combined with completely inadequate muffler support brackets.
The combination along with engine vibration crushed, then pieces fell out- both brand new gaskets during my 50 mile ride, allowing the mufflers to twist sideways and multiply the noise. I was lucky to not get a ticket for excess noise! Instead of cutting the doughnut flanges off and substituting flat, armored gaskets, I sold the still-pristine exhausts that same weekend.
Have not heard of the similar flat-gasket Mind-Train exhausts having this problem, only banging noises from the big 2-1/2" tubes hitting rear suspension parts while driving..Some pounding of clearance may be required. YMMV...