Whats the best way to get this fitting off

rklein383 said
I had to take an open hack saw blade and carefully cut a slit in the pipe. When it gets really close to getting all the way through, you can squish it with a pair of pliers and it will come out easily. Oh yeah, penetrating oil doesn't hurt.

You can speed up the process by using a cut off wheel or saws all for the portion of fitting that sticks out of the manifold.
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A tip from Detroit Diesel to get those pipe plugs out of iron, heat the plug and melt canning wax around the thread while hot. Let it cool, The heating expands the cast iron slightly and shrinks the plug. As it cools, some wax is drawn in to lubricate the threads. Should work for this.