I was doing Brake Cables on the 92 NA, and ended up snapping off two of three studs on the Passenger side Flange..
NO amount of heat or drilling would get the stud remnant to come out of the Flange.. I had to swap out the Manifold.. Not fun but do-able with the engine and crossmember intact..
The Exhaust on this car was out two yeard previous to replace to a One Piece Driveshaft.. Not sure thy it was being such a problem.. I always neversieze EVERYTHING..