The RC Engineering Evo X injectors come in both 750cc and 1000cc versions that are direct drop in injectors for your car. These injectors are capable of handling anything from a moderate setup to high horsepower builds. When you buy RC Engineering you know you are getting top quality parts and these are no different. The 750cc Evo X injectors are high impedance while the 1000cc injectors are Low Impedance and require Engine Management. Both include items needed for direct bolt on.