That is a 4 long-2 header with a 2-1 up-pipe mostly ELH. Isn't yours a short path ULH with a single crossover, single up-pipe? Completely different design and expansion characteristics if it is.
You would rather have a flex fail than a weld and Summit may have a better designed Flex than what you had. What diameter tubing?
You could also fab a slide sleeve inside a flex to maximize life if you can't find one of a similarly sturdy design.
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