Unplugging a plug wire was only my initial thought. I have tried multiple ways to deactivate a cylinder and each time I get an error on the program. (although I haven't tried removing a spark plug) If there were an easy way to modify the operation of the cylinder like higher resistance in the plug wire or somehow lower the pulse width on a single injector, then I hypothesize that it might work. Right now my guinea pig is a 98 Subaru 4 cylinder so my experiments thus far have been very limited. As far as the Catalytic converter is concerned I am being cautious. Do you have any ideas on how to actually trigger a cylinder using Pico diagnostics? Because that would be a far easier method than what I am suggesting. And just to clarify, this is the Pico diagnostics program I am talking about, not the Picoscope 6 program.