Cool new growth industry - removing kill switches from new cars :)
It is not likely to be that easy. It will be in the form of a message to the ECU telling it to stop working, as in stop firing the spark plugs, cut off the fuel, etc. You would have to mess with the ECU software. This is already illegal. The EPA is currently taking down aftermarket tuners for doing this. In addition, if you are required to get pollution checked, they will detect it through the OBD port. Also, since new cars are continuously in contact with the mother ship, it can be detected that way.
The only way around this will be driving older cars.