I must have flown like this 650nm over water, and over other hostile territory like the Rockies, since this was discovered only a few hours later. Having it welded at Dawley Aviation, Wisconsin. Patching doable, but it also depends how many more weak spots are found. Complete rebuild is $550. The weak spot though is unusual (according to tech at Dawley). They see more heat blisters and bulges, rather than a hole at this location.
No doubt Lucius you know the other names in the welding business e.g. Acorn Welding.
I wonder if you could get an inconel exhaust made? That is what the GT has and it reportedly lasts “for ever”. Mine looks like new at 2000hrs. AFAIK the pre-GT exhaust is the same shape as the GT exhaust and it may even be the same P/N but in any case nobody would spot the difference.
Turn around time 5 days with Dawley Aviation. Clamps inlet had to be done as well. So far, no complains.
I wonder if you could get an inconel exhaust made?