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Been there done that with the hole saw, sucks and difficult to keep centered, I don't recommed it. If you have a dremel, at this point you need to get one, cut the exaust end in an octagon pattern with a grinding disk, knock out the chrome center and finish off a round hole with 80grit sanding barrels.
It's a pain in the arse, but I think the level of frustration I reached made it more satisfing when I was finished.
Greg
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