So I’ve been struggling taking my exhaust studs out the ones from the manifold down to the catalytic converters all 6 of them broke and so far I’ve tried turbo sockets and vice grips on them I got a little to no movement. I’ve heated them red hot and cooled them off and repeated. As of now two of the studs broke flush and can no longer get a turbo socket on I just got some left hand drill bits but there no space for a drill I just need to get a different drill but what else have you guys done to get these out???

 

Weld a nut onto the broken end?