Yes. Spring steel. Cuts hard and hot. Use tough tools to do it. Measure twice, etc.
As for the tie rods:
I talked out this project with a guy who knows how to do it. This was a few years back, and I’ve not followed-through, but I remember this: A 2-inch narrowed beam will probably not need new tie rods, I was told, but it might–not will, might–need a few threads cut in the existing one(s) to make the adjustment work. Maybe a cut too. But again, my guy, who supposedly did hundreds of narrowed beams, said a little baby 2-inch narrow did not usually require all that much in the way of new parts or extra fiddling to make it work.