These Holley kits are intended to replace and upgrade existing fuel injection electronics or to provide a state-of-the-art electronic control module, if none is currently available. The Holley Commander 950 is the most powerful and capable ECU available on the market today. Capable of driving up to 8 high impedance and 4 low impedance injectors, the Commander 950 can provide all the power and sophistication required for any street or strip fuel injected motor. These Holley engine management system kits contain the Commander 950 ECU, wiring harness and sensors, where applicable, that you'll need to make a customized fuel injection installation.