you will have an emulator to turn off your petrol injectors and tell your ecu that there is nothing wrong, if you have injectors they will be drilled and tapped into your manifold as close to the head as possible x 4 , or if you have the older type you will have a big gas tube going to the inlet pipe near the throtle housing, where ther will be a venturi type effort inside the pipe or sat on the front of the throtle body.