Impact wrench and a powerful one at that. If all else fails a breaker bar pull out the starter and use a screwdriver to hold the starter ring teeth and hope. There is a to you can make or buy possibly rent look on amazon. I use the impact. Also try to tighten it a little just to break the static friction. It works. After you get the bolt off a sharp hammer blow to the face and some wiggle it should come off. Possibly some penetrating oil.
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