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I welded a cast iron manifold last year, its not too hard. Just pre-heat, weld, and post heat and slowly cool it. After that you should be good to go. But I would never expect a warranty for it. You never know the reason it cracked in the first place, casting inclusion, improper torque...

The resonators should always be after the muffler, the muffler will remove certain tones and the resonators take out the rest afterward. I had a terrible drone in my Ram with a magnaflow and ended up adding a summit glass pack just in front of the tip to get rid of it. (same thing Ma mopar did...