How I fixed the exhaust leaks on manifold & flange surface
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This is where I used sanding boards and a make shift sanding table to flat sand the flange surface and manifold surface.
BTW, make sure to wear a hankie over the nose or a mask. The iron dust starts flyng and you can end up breathing lot of it while sanding. I had black boogers coming out of my nose next day, I had to keep blowing my nose over and over in the shower. Also, it can make you feel bit sick.