Got the head pipe off and window cut in the cat. Now, what is the best way to get the core out? Drill it, chisel and dig it out or is there and easier way? Looks like it will be a bear to get it out. Will have a local welding shop weld the window back in. Left the O2 sensors in the head pipe. Should I remove them before welding or just protect them? Don't want to remove them if not necessary. Thanks,
Sunman