Like mentioned..it's all down to access...stripping engines day in day out at our works....rusty exhaust bolts and nuts can always slow the job down....we do have nut splitters at hand.....but you know what?.....there never used .cold chisel is the method....a good qaulity one that is...not one made of cheese and a nice lump hammer...not a toffee hammer. ....flanged nuts are a extra bit of work....watch that thumb if your a crap shot with the lump hammer.
And when those rusty nuts no longer fit the socket then we use nut gripper sockets like these from irwin....they bite into the rusty nut instead of slipping off like a standard socket.