Retorqued the copper one after the meet.
2 lower bolts < 8th of a turn, top one that I really didn't want to get loose in the first place and used some persuasion on didn't budge.
I could not find a 3" 2-bolt gasket for the mid-cat connection at a bunch of stores including summit, so for now, it got the high temp silicone. We will see if that holds up. I have used it further back on a bunch of exhausts with great success, but don't know how it will do up there. it survived the spirited drive to/from the meet OK.
Also added a
"Vortex" cone at the rear to replace my lost "Twister" insert/silencer.