If you are frame mounting the turbo you may want a flex joint in the exhaust to keep "piping" forces from ruining the turbo(s).
I used up a grinding wheel cleaning up the plasma cuts on the outer edges of all my flanges, and had to sharpen my die grinder bits a few times truing up the centers. Wish I had easy (cheap) access to laser or water jet. I should have used my cut off wheel on the square flange for the turbo mount. I'didnt even want to attempt using a hole saw for the centers.
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