it does a combo of shutting off the fuel pump, and disabling the ground to the injectors. Bypassing the fuel pump isnt a problem, as you can just hotlead the fuel pump wires to an accessory. The ground on the injectors though, is the problem. You will either need a 50hz square wave signal to the pcm, or put a bcm in there. You can also buy a reprogrammed pcm that has all the vats deleted. I think thats the best way, but be prepared to spend $400.