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1979 911SC Broken Exhaust Studs

Engine

Vehicle Information: Model: 911sc; Year: 1979; Body Type: Targa; Total Mileage: 77500;

I purchased a set of SSI heat exchangers, dual inlet/dual outlet sportmuffler and all the hardware needed. I have tried to remove the old boltsfirst by soaking the bolts with penetrating oil for a week and thenheating the bolts cherry red. Nothing had worked so I tried to use moreforce and with this method I broke 9 studs flush with the exhaust flangeso about 10 mm of the stud is sticking out of the head. I got lucky and 3bolts came loose, but the studs look to be in bad shape. What should I doto remove them? I have made a jig to drill the studs out but after onethat took 2 hours I would like some help. Can I drill & tap the studs to10 mm?

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