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Well some success today.
I went to lowes and got a carbide multi material bosch bit and another cobalt dewalt bit.
The cobalt bit didn't really do much of anything. The bosch carbide bit slowly made its way through the remainder of the hole. Then I was able to increase the size of the hole with the bits I already had.
Unfortunately when the bosch bit exited the hole 1/2 of the tip broke off rendering the bit useless for the next bolt extraction.
Poking around the toolbox I found a pack of High Speed Steel countersink/drill bits that I had bought probably 10 - 12 years ago that I never used.
Now those things went through the next bolt like a knife in butter. So I was able to get through a whole bolt pretty quickly in about 30 minutes or so altogether.
I have to deal with the 2 studs that broke that are on the car still, I think I have a chance at backing them off as there is a nut welded onto the cat side. Only 1 of the pipe side nuts did loosen on the day I removed the exhaust, I may drill that one out.
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