Scott-
I would tie that main bracket into the head bolts or something more solid than the aluminum muffler box bracket, which is not strong enough. The OEM mufflers made those crack and break; that muffler will break it much faster.
Something else to think about: You have part of support hardware connected to the engine, and part of it connected to the tractor frame. The engine is going to move around a bit relative to the frame because of the engine mounts, so you're also likely to crack any or all of the pieces you are using to mount the muffler to the engine and frame.
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